u.s. department of the interior seismicity of the earth...

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Yucatan Basin Campeche Bank Lightning Bank Clark Basin Colombian Basin Volcan Bank Bahama Bank Silver Bank Caicos Bank Navidad Bank Guatamala Basin Panama Basin Malpelo Ridge Coiba Ridge P U E R T O R I C O T R E N C H C A Y M A N T R E N C H M U E R T O S T R O U G H Mona Trough Yuma Trough S o m b r e r o T r o u g h gh Hispaniola Trough C O L O M B I A N T R E N C H Z . L E S S E R A N T I L L E S T R E N C H M I D D L E A M E R I C A T R E N C H L E S S E R A N T I L L E S ATLANTIC OCEAN M a r i n e r R i d g e Aves Ridge G r a n a d a B a s i n Algol Seamount Paramount Seamount Medina Seamount Guardian Seamount Fisher Seamount West Cocos Seamount Colón Ridge T o b a g o B a s i n B a r b a d o s R i d g e NICARAGUA HONDURAS PANAMA SURINAME PUERTO RICO (U.S.) JAMAICA HAITI TRINIDAD AND TOBAGO DOMINICAN REPUBLIC BELIZE EL SALVADOR VENEZUELA COLOMBIA PERU BRAZIL BARBADOS DOMINICA ANTIGUA AND BARBUDA ST. KITT'S AND NEVIS ST. LUCIA ST. VINCENT AND THE GRENADINES NETHERLANDS ANTILLES GRENADA BAHAMAS TURKS AND CAICOS IS. (U.K.) GUYANA CUBA BRITISH VIRGIN ISLANDS (U.K.) U.S. VIRGIN ISLANDS (U.S.) COSTA RICA ECUADOR GUATEMALA MEXICO Caribbean Sea Hispaniola G R E A T E R A N T I L L E S Venezuela Basin Bahia de Panamá Golfo de Venezuela Gulf of Honduras Golfo de Fonseca Golfo de Los Mosquitos Golfo de Chiriqui Golfo de Panamá Lago de Maracaibo Lago de Nicaragua Beata Ridge L e e w a rd Isla n ds Antigua Barbuda Guadeloupe (France) Martinique (France) Montserrat (U.K.) Isla de Margarita (Venez.) Tobago Isla La Tortuga (Venez.) Aruba (Neth.) Curaçao Marie-Galante Grand Inagua Island Isla Blanquilla (Venez.) The Grenadines Isla Orchilla (Venez.) Islas Los Roques (Venez.) Dominica St. Kitt's Nevis Anguilla (U.K.) St. Martin (France & Neth. Antilles) Grenada St. Vincent St. Lucia Barbados Trinidad St. Croix Mona I. Île de la Gonâve Isla de la Juventud Isla de la Roatán Turneffe Is. Isla Cozumel Arch. de las Perlas Long I. Crooked I. Acklins I. Mayaguana I. Caicos Is. (U.K.) Vieques (U.S.) Turks Island Ja r d i n e s d e la Rei na A r c h . d e C a m a g ü e y Cayo Romano Great Exuma Grand Cayman I. B a h a m a I s l a n d s Bonaire Isla Isabela Isla Fernandina Isla Santa Cruz Isla Santa Maria Isla Pinta I. del Rey I. de Coiba Isla Isabela Isla San Salvador Isla San Cristóbal Isla Española Isla Marchena Galapagos Islands (Archipiélago de Colón) (Ecuador) Isla del Coco (Costa Rica) Isla Culpepper Isla Wenman Cayos Miskitos Isla de San Andres Isla de Providencia I. del Maiz Grande I. Coiba B a h a m a I s l a n d s W o o d w ard Islan ds CAYMAN IS. (U.K.) C a r n e g i e R i d g e A B A' B' C' A A B B A' A' B' B' C C C' C' B' D' D D D' E E F F G G G' G' G' F' F' F' E' E' E' 600 100 50 300 100 200 200 50 100 2001 1900 1902 1942 1943 1946 1958 1979 1991 1902 1934 1942 1946 1950 1976 1983 1992 Panama Bucaramanga Villahermosa Tuxtla Gutierrez Maracay Valencia Ibague Cartagena Barranquilla San Pedro Sula Veracruz Quito Guayaquil Merida Tegucigalpa Santo Domingo Santiago De Cuba Caracas Kingston Cucuta Maracaibo San Salvador Port-au-Prince Cali Medellin Bogota Manizales Havana Barquisimeto Guatemala City Managua 1906 90° 65° 10° 85° 60° 10° 85° 60° 15° 80° 15° 20° 75° 20° 75° 95° 70° 95° 70° 90° 65° Bay of Campeche Gulf of Mexico Rosalind Bank Serranilla Bank Sue Ridge Mexico Basin Alice Shoal P e d r o Ba n k Kingston Bank P a p a g a y o s R i d g e Cayman Ridge PACIFIC OCEAN Tehauntepec Ridge COCOS PLATE PERU PANAMA BELIZE DOMINICAN REPUBLIC NORTH AMERICA PLATE VENEZUELA NICARAGUA JAMAICA GUYANA NAZCA PLATE GUATEMALA MEXICO PUERTO RICO SOUTH AMERICA PLATE COLUMBIA COSTA RICA HAITI SUR CARIBBEAN PLATE BRAZIL HONDURAS CUBA ECUADOR 20.0 20.0 81.2 20.0 20.0 72.6 20.0 65.0 20.0 20.0 20.0 81.2 20.0 20.0 72.6 20.0 65.0 20.0 70° 80° 60° 80° 60° 90° 70° 90° 20° 20° 10° 10° SEISMIC HAZARD AND RELATIVE PLATE MOTION . 6.5–6.9 Depth of focus 7–7.4 0–69 km 7.5 70–299 km 7.6 300–700 km Active volcanoes 7.7 Air 7.8 Nucleation points of M>8.3 events 7.9 Upper mantle Distance (km) 8.0 8.1 Lower mantle 8.2 Earth structure Crust Depth (km) Magnitude classes Transition zone 4–5.9 6–6.4 DEPTH PROFILE EXPLANATION Profiles of earthquake and volcano locations are constructed from the mapped data. Locations of the profile intersection with the surface are drawn in the map and labeled to coincide with the profile label. Length of the profile graphic is the same as in the map. Distance in kilometers from the trench axis is indicated in the X direction, depth in kilometers is indicated in the Y direction. There is no vertical exaggeration. See Explanation at side for color key. Not all earth layers, earthquake depths and magnitude, are visible on every map. PROFILE X TRENCH AXIS -100 0 100 200 300 400 500 600 -700 -600 -500 -400 -300 -200 -100 0 100 PROFILE G G G' -300 -100 0 -200 0 -200 -100 TRENCH AXIS PROFILE F -200 0 -200 -100 -300 -100 0 F F' TRENCH AXIS PROFILE E -100 0 -300 -200 -500 0 -200 -100 -400 -300 TRENCH AXIS E E' PROFILE D -100 0 100 200 -100 0 TRENCH AXIS D D PROFILE C -100 -200 200 0 -100 300 100 0 TRENCH AXIS C C' PROFILE B 300 0 100 -200 400 200 -100 0 -300 TRENCH AXIS TRENCH AXIS PROFILE A 0 -300 300 0 100 -200 400 200 -100 B B' A A' 3 1870 1897 1873 1894 1797 1853 1878 1849 1610 1843 1842 1839 1831 1788 1812 1780 1770 1766 1692 1875 1673 PRE-INSTRUMENTAL SEISMICITY 1500–1899 VENEZUELA GUYANA CUBA HAITI PUERTO RICO DOMINICAN REPUBLIC COLOMBIA PANAMA NICARAGUA HONDURAS BELIZE MEXICO COSTA RICA 65° 10° 85° 60° 85° 80° 60° 15° 10° 80° 15° 10° 20° 75° 75° 70° 70° 65° REFERENCES Bird, Peter, 2003, An updated digital model of plate boundaries: Geochemistry Geophysics Geosystems, v. 4, no. 3, 52 p. DeMets, Charles, Gordon, R.G., Argus, D.F., and Stein, Seth, 1994, Effects of recent revisions to the geomagnetic time scale on estimates of current plate motions: Geophysical Research Letters, v. 21, p. 2191–2194. DeMets, Charles, Jansma, P.E., Mattioli, G.S., Dixon, T.H., Farina, F., Bilham, R., Calais, E., and Mann, P., 2000, GPS geodetic constraints on Caribbean–North America plate motion: Geophysical Research Letters, v. 27, p. 437–440. Dixon, T.H., Farina, F., DeMets, Charles, Jansma, P., Mann, P., and Calais, E., 1998, Relative motion between the Caribbean and North American plates and related boundary zone deformation from a decade of GPS observations: Journal of Geophysical Research, 103(B7), p. 15157–15182. Engdahl, E.R., and Villaseñor, Antonio, 2002, Global seismicity 1900–1999, in Lee, W.H.K., Jennings, P., Kisslinger, Carl, and Kanamori, Hiroo, eds, International Handbook of Earthquake and Engineering Seismology, v. 81(A), chap. 41, p. 1–26. GEBCO, 2008, The GEBCO_08_Grid, ver. 20091120, http://www.gebco.net/, last accessed January 8, 2010. Giardini, D., Grünthal, G., Shedlock, K., Zhang, P ., and Global Seismic Hazards Program, 1999, Global Seismic Hazards Map, http://seismo.ethz.ch/GSHAP, last accessed January 9, 2007. Hayes, Gavin, and Wald, David, 2010, Slab models for subduction zones: U.S. Geological Survey Earthquake Hazards Program, last accessed July, 22, 2010 at http://earthquake.usgs.gov/research/data/slab/. Kanamori, Hiroo, and McNally, K.C., 1982, Variable rupture mode of the subduction zone along the Ecuador-Colombia coast: Bulletin of the Seismological Society of America, v. 72, no. 4, p. 1241–1253. NOAA, 2010, National Geophysical Data Center: National Oceanic and Atmospheric Administration, accessed on March 31, 2010 at http://www.ngdc.noaa.gov/hazards. Okal, E.A., 1992, Use of the mantle magnitude Mm for the reassessment of the moment of historical earthquakes: Pure and Applied Geophysics, v. 139, no.1, p. 17–57. Siebert, Lee, and Simkin, Thomas, 2002, Volcanoes of the world: An illustrated catalog of Holocene volcanoes and their eruptions: Smithsonian Institution, Global Volcanism Program Digital Information series, GVP–3, http://www.volcano.si.edu/world/, last accessed January 9, 2007. Tarr, A.C., Villaseñor, Antonio, Furlong, K.P., Rhea, Susan, and Benz, H.M., and 2010, Seismicity of the earth 1900–2007: U.S. Geological Survey Scientific Investigations Map 3064, scale 1:25,000,000. Weber , J.C., Dixon, T.H., DeMets, Charles, Ambeh, W.B., Jansma, Pamela, Mattinoli, Glen, Saleh, Jarir, Sella, Giovanni, Bilham, Roger, and Pérez, Omar , 2001, GPS estimate of relative motion between the Caribbean and South American plates, and geologic implications for Trinidad and Venezuela: Geology, v. 29, no. 1, p. 75–78. DATA SOURCES The earthquakes portrayed on the main map and the depth profiles are taken from two sources: (a) the Centennial earthquake catalog (Engdahl and Villaseñor, 2002) and annual supplements for the interval 1900–2007, where the magnitude floor is 5.5 globally, and (b) a catalog of earthquakes having high-quality depth determinations for the period 1964–2002 and a magnitude range of 5.0≥M≤5.4 (Engdahl, personal commun., 2009.) The nucleation points of great earthquakes (M≥8.3) are designated with a label showing the year of occurrence. Their rupture areas are shown as pale reddish polygons. Major earthquakes (7.5≥M≤8.2) are labeled with the year of occurrence, while earthquakes (8.0≥M≤8.2) are labeled with the year of occurrence and also denoted by a white outline (Tarr and others, 2010). The Seismic Hazard and Relative Plate Motion map displays the generalized seismic hazard of the region (Giardini and others, 1999) and representative relative plate motion vectors of the Caribbean plate relative to the adjacent North and South America plates using the NUVEL–1A model (DeMets and others, 1994, 2000) and updates (Dixon and others, 1998; Weber and others, 2001). Pre-instrumental seismicity for the Caribbean basin was obtained from the NOAA National Geophysical Data Center (2010) database of significant earthquakes; locations are approximate, based on macro-seismic reports and field investigations. We selected earthquakes with associated reports of moderate to major damage, 10 or more deaths, an estimated magnitude of 7.5 or greater (if known), Modified Mercalli Intensities X, or tsunami generation. Base map data sources include GEBCO 2008, Volcanoes of the World dataset (Siebert and Simkin, 2002), plate boundaries (Bird, 2003), Digital Chart of the World (1992), and Environmental Sciences Research Institute (ESRI, 2002). Slab contours are from Hayes and Wald (2010). TECTONIC SUMMARY Extensive diversity of tectonic regimes characterizes the perimeter of the Caribbean plate, involving no fewer than four major adjacent plates (North America, South America, Nazca, and Cocos). Inclined zones of deep earthquakes (Wadati-Benioff zones), deep ocean trenches, and arcs of volcanoes clearly indicate subduction of oceanic lithosphere along the Central American and Atlantic Ocean margins of the Caribbean plate, while shallow seismicity and focal mechanisms of major shocks in Guatemala, northern Venezuela, and the Cayman Ridge and Cayman Trench indicate transform fault and pull-apart basin tectonics. The depth profile panels on this map portray earthquakes that extend from the Middle America Trench axis in the west to depths as great as 300 km beneath Guatemala, and from the Lesser Antilles Trench axis in the east to depths of approximately 200 km beneath Guadeloupe and the northeast Caribbean. In contrast, seismicity along the segments of the Caribbean plate margins from Guatemala to Hispaniola and from Trinidad to western Venezuela is indicative of transform fault tectonics. Along the northern margin of the Caribbean plate, the North America plate moves west, relative to the Caribbean plate, at approximately 20 mm/yr, resulting in major transcurrent faults and troughs. Farther east, the North America plate subducts beneath the Caribbean plate resulting in surface expression of the deep Puerto Rico Trench and a zone of intermediate focus earthquakes in the subducted slab. The plate boundary curves around Puerto Rico and the northern Lesser Antilles where the plate motion vector of the Caribbean plate relative to the North and South America plates is less oblique, resulting in active island-arc tectonics. The North and South America plates subduct beneath the Caribbean plate along the Lesser Antilles Trench at rates of about 20 mm/yr; consequently, there are both intermediate focus earthquakes within the subducted South America plate and a chain of active volcanoes along the island arc. The southern Caribbean plate boundary along with the South America plate strikes east-west across Trinidad and western Venezuela and is characterized by major strike-slip faults and shallow seismicity, resulting from relative plate motion of about 20 mm/yr. Further to the west, a broad zone of convergent deformation trends southwest across western Venezuela and central Columbia. Plate boundaries are not well defined across northern South America, but there is a transition from Caribbean/South America convergence in the east to Nazca/South America convergence in the west, described in more detail below. The transition zone is characterized by high seismic hazard. The Nazca-Caribbean plate boundary offshore of Columbia is characterized by convergence (Nazca plate subducting under South America plate) at about 65 mm/yr. The January 6, 1906 Mw = 8.5 megathrust subduction earthquake occurred on a shallow-dipping interface of this plate boundary segment. The 1906 earthquake occurred in the Colombia-Ecuador region, with a seismic moment (Mo; equivalent to radiated energy) of 6×10 Exp 28 dyne-cm (Okal, 1992), and a moment magnitude (Mw) of 8.5 (Tarr and others, 2010). The nucleation point of this earthquake is indicated on the map (rupture area is from Kanamori and McNally, 1982). Along the western coast of Central America, the Cocos plate subducts beneath the Caribbean plate at rates of 72–81 mm/yr, resulting in a relatively high seismic hazard and a chain of numerous active volcanoes; here intermediate-focus earthquakes occur within the subducted Cocos plate to depths of nearly 300 km. 8.2 200 Tsunami/deaths (yr) 600 Divergent Magnitude classes Mean slab depth 4–5.9 100 6–6.4 6.5–6.9 Historical earthquakes Depth of focus 300 7–7.4 0–69 km Deaths (yr) 7.5 Plate boundaries 70–299 km Tsunami 7.6 300–700 km Rupture zones Others 7.7 Nucleation points 7.8 MAP EXPLANATION Active volcanoes 7.9 8.0 50 km 8.1 FIGURE EXPLANATION 80.0–100.0 0–0.2 m/s² Divergent Relative plate motion 0.4–0.8 1.6–3.2 Subduction 20.0–39.9 Transform 6.4–9.8 Inferred 60.0–79.9 Convergent Peak ground acceleration Plate boundaries 0.2–0.4 Transform 0.8–1.6 11.0–19.9 mm/yr Inferred 3.2–6.4 Convergent 40.0–59.9 Subduction OPEN-FILE REPORT 2010–1083-A Revised September, 2011 U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Seismicity of the Earth 1900–2010 Caribbean Plate and Vicinity Compiled by Harley M. Benz, 1 Arthur C. Tarr, 1 Gavin P . Hayes, 1 Antonio Villaseñor, 2 Kevin P. Furlong, 2 Richard L. Dart, 1 and Susan Rhea 1 2011 1 U.S. Geological Survey 2 Institute of Earth Sciences, CSIC, Barcelona, Spain 3 Department of Geosciences, Pennsylvania State University, State College, PA 16802 USA 600 Scale 500 KILOMETERS 0 1:8,000,000 400 800 100 300 700 200 Universal Transverse Mercator projection Digital map database and cartography by Susan Rhea and Art Tarr Manuscript approved for publication Nov. 16, 2011 Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner This and other USGS information products are available at http://store.usgs.gov/. U.S. Geological Survey Box 25286, Denver Federal Center Denver, CO 80225 To learn about the USGS and its information products visit http://www.usgs.gov/. 1-888-ASK-USGS. This report is available at: http://pubs.usgs.gov/of/2010/1083/a For more information concerning this publication, contact: Center Director, USGS Geologic Hazards Science Center Box 25046, Mail Stop 966 Denver, CO 80225 (303) 273-8579 Or visit Geologic Hazards Science Center Web site at: http://geohazards.cr.usgs.gov/ Suggested citation: Benz, H.M., Tarr, A.C., Hayes, G.P., Villaseñor, Antonio, Furlong, K.P., Dart, R.L., and Rhea, Susan, 2011, Seismicity of the Earth 1900–2010 Caribbean plate and vicinity: U.S. Geological Survey Open-File Report 2010–1083-A, scale 1:8,000,000.

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Page 1: U.S. DEPARTMENT OF THE INTERIOR Seismicity of the Earth ...blogs.4j.lane.edu/hohenemser/files/2020/02/Caribean-Plate-Tectonics.pdfIsla Fernandina Isla Santa Cruz Isla Santa Maria Isla

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DEPTH PROFILE EXPLANATION

Profiles of earthquake and volcanolocations are constructed from themapped data. Locations of the profileintersection with the surface aredrawn in the map and labeled tocoincide with the profile label. Lengthof the profile graphic is the same as inthe map. Distance in kilometers fromthe trench axis is indicated in the Xdirection, depth in kilometers isindicated in the Y direction. There isno vertical exaggeration. SeeExplanation at side for color key. Notall earth layers, earthquake depths andmagnitude, are visible on every map.

PROFILE X

TRENCH AXIS

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400200

-100

0

-300

TRENCH AXIS

TRENCH AXIS

PROFILE A

0

-300

300

0

100

-200

400200

-100

B B'

A A'

3

1870

1897

1873

189417971853

1878

1849

1610

1843

1842

1839

1831

1788

1812

17801770

1766

1692

1875

1673

PRE-INSTRUMENTAL SEISMICITY 1500–1899

V E N E Z U E L A G U Y A N A

C U B A

H A I T IP U E R T O

R I C O

D O M I N I C A NR E P U B L I C

C O L O M B I AP A N A M A

N I C A R A G U A

H O N D U R A S

B E L I Z E

M E X I C O

C O S T AR I C A

65°

10°

85° 60°

85° 80° 60°

15°

10°

80°

15°

10°

20°

75°

75°

70°

70°

65°

REFERENCES

Bird, Peter, 2003, An updated digital model of plate boundaries: Geochemistry Geophysics Geosystems, v. 4, no. 3, 52 p.DeMets, Charles, Gordon, R.G., Argus, D.F., and Stein, Seth, 1994, Effects of recent revisions to the geomagnetic time scale on estimates of current

plate motions: Geophysical Research Letters, v. 21, p. 2191–2194.DeMets, Charles, Jansma, P.E., Mattioli, G.S., Dixon, T.H., Farina, F., Bilham, R., Calais, E., and Mann, P., 2000, GPS geodetic constraints on

Caribbean–North America plate motion: Geophysical Research Letters, v. 27, p. 437–440.Dixon,

.

T.H., Farina, F., DeMets, Charles, Jansma, P., Mann, P., and Calais, E., 1998, Relative motion between the Caribbean and North Americanplates and related boundary zone deformation from a decade of GPS observations: Journal of Geophysical Research, 103(B7),p. 15157–15182.

.

Engdahl, E.R., and Villaseñor, Antonio, 2002, Global seismicity 1900–1999, in Lee, W.H.K., Jennings, P., Kisslinger, Carl, and Kanamori, Hiroo, eds,International Handbook of Earthquake and Engineering Seismology, v. 81(A), chap. 41, p. 1–26.

GEBCO, 2008, .

The GEBCO_08_Grid, ver. 20091120, http://www.gebco.net/, last accessed January 8, 2010.Giardini, D., Grünthal, G., Shedlock, K., Zhang, P

.

., and Global Seismic Hazards Program, 1999, Global Seismic Hazards Map,http://seismo.ethz.ch/GSHAP, last accessed January 9, 2007.

Hayes, Gavin, and . Wald, David, 2010, Slab models for subduction zones: U.S. Geological Survey Earthquake HazardsProgram, last accessed July, 22, 2010 at http://earthquake.usgs.gov/research/data/slab/.

Kanamori, Hiroo, and McNally, K.C., 1982, Variable rupture mode of the subduction zone along the Ecuador-Colombia coast: Bulletin of theSeismological Society of

.

America, v. 72, no. 4, p. 1241–1253.NOAA, 2010, National Geophysical Data Center: National Oceanic and Atmospheric Administration, accessed on March 31, 2010 at

http://www.ngdc.noaa.gov/hazards.Okal, E.A., 1992, Use of the mantle magnitude Mm for the reassessment of the moment of historical earthquakes: Pure and . Applied Geophysics,

v. 139, no.1, p. 17–57.Siebert, Lee, and Simkin, Thomas, 2002, Volcanoes of the world: An illustrated catalog of Holocene volcanoes and their eruptions: Smithsonian

Institution, Global .

Volcanism Program Digital Information series, GVP–3, http://www.volcano.si.edu/world/, last accessed January 9, 2007.Tarr, A.C., Villaseñor, Antonio, Furlong, K.P., Rhea, Susan, and Benz, H.M., and 2010, Seismicity of the earth 1900–2007: U.S. Geological Survey

Scientific Investigations Map 3064, scale 1:25,000,000.Weber

.

, J.C., Dixon, T.H., DeMets, Charles, Ambeh, W.B., Jansma, Pamela, Mattinoli, Glen, Saleh, Jarir, Sella, Giovanni, Bilham, Roger, andPérez, Omar

.

, 2001, GPS estimate of relative motion between the Caribbean and South American plates, and geologic implications for Trinidadand Venezuela: Geology, v. 29, no. 1, p. 75–78.

DATA SOURCES

The earthquakes portrayed on the main map and the depth profiles are taken from two sources: (a) the Centennial earthquake catalog(Engdahl and Villaseñor, 2002) and annual supplements for the interval 1900–2007, where the magnitude floor is 5.5 globally, and (b)a catalog of earthquakes having high-quality depth determinations for the period 1964–2002 and a magnitude range of 5.0≥M≤5.4(Engdahl, personal commun., 2009.)

The nucleation points of great earthquakes (M≥8.3) are designated with a label showing the year of occurrence. Their rupture areasare shown as pale reddish polygons. Major earthquakes (7.5≥M≤8.2) are labeled with the year of occurrence, while earthquakes(8.0≥M≤8.2) are labeled with the year of occurrence and also denoted by a white outline (Tarr and others, 2010).

The Seismic Hazard and Relative Plate Motion map displays the generalized seismic hazard of the region (Giardini and others, 1999) andrepresentative relative plate motion vectors of the Caribbean plate relative to the adjacent North and South America plates using theNUVEL–1A model (DeMets and others, 1994, 2000) and updates (Dixon and others, 1998; Weber and others, 2001).

Pre-instrumental seismicity for the Caribbean basin was obtained from the NOAA National Geophysical Data Center (2010) databaseof significant earthquakes; locations are approximate, based on macro-seismic reports and field investigations. We selectedearthquakes with associated reports of moderate to major damage, 10 or more deaths, an estimated magnitude of 7.5 or greater (ifknown), Modified Mercalli Intensities X, or tsunami generation.

Base map data sources include GEBCO 2008, Volcanoes of the World dataset (Siebert and Simkin, 2002), plate boundaries (Bird,2003), Digital Chart of the World (1992), and Environmental Sciences Research Institute (ESRI, 2002). Slab contours are from Hayes and Wald(2010).

TECTONIC SUMMARY

Extensive diversity of tectonic regimes characterizes the perimeter of the Caribbean plate, involving no fewer than four major adjacentplates (North America, South America, Nazca, and Cocos). Inclined zones of deep earthquakes (Wadati-Benioff zones), deep oceantrenches, and arcs of volcanoes clearly indicate subduction of oceanic lithosphere along the Central American and Atlantic Oceanmargins of the Caribbean plate, while shallow seismicity and focal mechanisms of major shocks in Guatemala, northern Venezuela,and the Cayman Ridge and Cayman Trench indicate transform fault and pull-apart basin tectonics.

The depth profile panels on this map portray earthquakes that extend from the Middle America Trench axis in the west to depths asgreat as 300 km beneath Guatemala, and from the Lesser Antilles Trench axis in the east to depths of approximately 200 km beneathGuadeloupe and the northeast Caribbean. In contrast, seismicity along the segments of the Caribbean plate margins from Guatemalato Hispaniola and from Trinidad to western Venezuela is indicative of transform fault tectonics.

Along the northern margin of the Caribbean plate, the North America plate moves west, relative to the Caribbean plate, at approximately20 mm/yr, resulting in major transcurrent faults and troughs. Farther east, the North America plate subducts beneath the Caribbean plateresulting in surface expression of the deep Puerto Rico Trench and a zone of intermediate focus earthquakes in the subducted slab.

The plate boundary curves around Puerto Rico and the northern Lesser Antilles where the plate motion vector of the Caribbean platerelative to the North and South America plates is less oblique, resulting in active island-arc tectonics. The North and South Americaplates subduct beneath the Caribbean plate along the Lesser Antilles Trench at rates of about 20 mm/yr; consequently, there are bothintermediate focus earthquakes within the subducted South America plate and a chain of active volcanoes along the island arc.

The southern Caribbean plate boundary along with the South America plate strikes east-west across Trinidad and western Venezuelaand is characterized by major strike-slip faults and shallow seismicity, resulting from relative plate motion of about 20 mm/yr. Furtherto the west, a broad zone of convergent deformation trends southwest across western Venezuela and central Columbia. Plateboundaries are not well defined across northern South America, but there is a transition from Caribbean/South America convergencein the east to Nazca/South America convergence in the west, described in more detail below. The transition zone is characterized byhigh seismic hazard.

The Nazca-Caribbean plate boundary offshore of Columbia is characterized by convergence (Nazca plate subducting under SouthAmerica plate) at about 65 mm/yr. The January 6, 1906 Mw = 8.5 megathrust subduction earthquake occurred on a shallow-dippinginterface of this plate boundary segment. The 1906 earthquake occurred in the Colombia-Ecuador region, with a seismic moment(Mo; equivalent to radiated energy) of 6×10 Exp 28 dyne-cm (Okal, 1992), and a moment magnitude (Mw) of 8.5 (Tarr and others,2010). The nucleation point of this earthquake is indicated on the map (rupture area is from Kanamori and McNally, 1982).

Along the western coast of Central America, the Cocos plate subducts beneath the Caribbean plate at rates of 72–81 mm/yr, resultingin a relatively high seismic hazard and a chain of numerous active volcanoes; here intermediate-focus earthquakes occur within thesubducted Cocos plate to depths of nearly 300 km.

8.2

200

Tsunami/deaths (yr)

600

Divergent

Magnitude classes

Mean slab depth

4–5.9

100

6–6.4

6.5–6.9

Historical earthquakes

Depth of focus

300

7–7.4

0–69 km

Deaths (yr)

7.5

Plate boundaries

70–299 km

Tsunami

7.6

300–700 km

Rupture zones

Others

7.7

Nucleation points

7.8

MAP EXPLANATION

Active volcanoes

7.9

8.0

50 km

8.1

FIGURE EXPLANATION

80.0–100.0

0–0.2 m/s²

Divergent

Relative plate motion

0.4–0.8

1.6–3.2

Subduction

20.0–39.9

Transform

6.4–9.8

Inferred

60.0–79.9

Convergent

Peak ground acceleration

Plate boundaries

0.2–0.4

Transform

0.8–1.6

11.0–19.9 mm/yr

Inferred

3.2–6.4

Convergent

40.0–59.9

Subduction

OPEN-FILE REPORT 2010–1083-ARevised September, 2011

U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

Seismicity of the Earth 1900–2010Caribbean Plate and VicinityCompiled by Harley M. Benz,1 Arthur C. Tarr,1 Gavin P

. Hayes,1 Antonio Villaseñor,2 Kevin P. Furlong,2 Richard L. Dart,1 and Susan Rhea1

20111U.S. Geological Survey2Institute of Earth Sciences, CSIC, Barcelona, Spain3Department of Geosciences, Pennsylvania State University, State College, PA 16802 USA

600Scale

500KILOMETERS

01:8,000,000400 800100 300 700200

Universal Transverse Mercator projection

Digital map database and cartography by Susan Rhea and Art Tarr

Manuscript approved for publication Nov. 16, 2011

Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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This report is available at:http://pubs.usgs.gov/of/2010/1083/a

For more information concerning this publication, contact:Center Director, USGS Geologic Hazards Science CenterBox 25046, Mail Stop 966Denver, CO 80225(303) 273-8579

Or visit Geologic Hazards Science Center Web site at:http://geohazards.cr.usgs.gov/

Suggested citation:Benz, H.M., Tarr, A.C., Hayes, G.P., Villaseñor, Antonio, Furlong, K.P., Dart, R.L., and Rhea, Susan, 2011, Seismicity of the Earth 1900–2010 Caribbean plate and vicinity: U.S. Geological Survey Open-File Report 2010–1083-A, scale 1:8,000,000.