towards global insar deformation monitoring of volcanoes · 2019-09-25 · pat3 alal phan slpc mlsp...
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Towards global InSAR deformation monitoring of volcanoes
insarmaps.miami.edu
Falk Amelung, Yunjun Zhang, Alfredo Terrero, Joshua Zahner
University of Miami
Bhuvan Varugu,Sara Mirzaee• Outline
• Sentinel-1, NISAR
• Examples from Ecuador, Indonesia
• Mauna Loa 2014-2017
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Global SAR coverage with Sentinel-1
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Time
Network of SAR acquisitions
Sentinel-1
LOS velocity (and time series)
Distributed Scatterer Method
InSAR time series analysis
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One measurement every
6-12 days
ContinuousInSAR
Timeseries(C-InSAR)
200 acquisitions acquired for Europe
(ascending plus descending)
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InSAR time series analysis
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THE NASA-ISRO SAR (NISAR) DUAL-BAND MISSION
© 2019 California Institute of Technology. Government sponsorship acknowledged.
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6Rosen,
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8Rosen,
• L0, L1, L2 data products: SLCs, terrain-corrected SLCs, interferograms (unwrapped).
• Open and Free. From the Cloud (distributed by the ASF).
NISAR Data Products: Available from the Cloud
New for NiSAR:- Geocoded SLCs and
interferograms.- On-demand processing on
the Cloud: allows users to
satisfy their needs - (Custom-on-demand capability)
Relevance of GPS- Cal-Val of geod. measuremnts
- Tropospheric correction(Ionospheric correction?)
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NISAR Science User’s Handbook
Rosen,
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• Deformation can be one of the first signs of impending eruptions, along with earthquakes and degassing
Earthquakes
Deformation
(Inflation)
What happens before an eruption?
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GasEruption
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KDP-B DPMC 2-11
August 2015 Eruption
The 2015 crisis of Cotopaxi
volcano,
Concerns:• many fatalities from 1877
eruption • lahars (can go to the
coast)
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KDP-B DPMC 2-12
Seismicity
Concurrent seismicity increase and inflation at station MORU (InSAR and GPS)
Start of eruption
Morales Rivera et al., 2017
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KDP-B DPMC 2-13
Precursory inflation from InSAR time-series before unrest unrest period
Morales Rivera, Amelung et al., GRL in review
Data used: 70 Cosmo-SkymedSAR images from Geohazard
Supersites initiative
Key findings:• InSAR detects 3 cm
inflation on SW flank before eruption.
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KDP-B DPMC 2-14
Precursory inflation from InSAR time-series before unrest unrest period
Morales Rivera, Amelung et al., GRL 2017
eruptive, post-eruptive period
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Guagua Pichincha
Dacitic Stratovolcano 4760 m 10 km from downtown Quito
last big eruption in 1660
October 7
1999
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2014 - 2015
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2014 - 2015
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2016 - today
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Inter-Andean Valley, Ecuador, Sentinel, 2015-2019
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Eruptions of Mauna Loa and
Kilauea volcanoes commonly
occur from the rift zones
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Lava flow hazards of Mauna Loa eruptions
Hilo Hawai’i, 1984
.
Fissure eruptions from dikes intruded into rift zone (1950, 1975, 1984).
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based on ~60 SAR images
http://hvo.wr.usgs.gov/maunaloa/history/50_06_01/
M6.5(?) quake:
first vent (eruption start):
downrift vent:
ocean reached:
May 29, 3:17 pm
May 31, 9:25 pm
June 1 10:15 pm
June 2 1:05 am
1950 eruption time line:
3 hours for lava to reach the ocean !1950 ocean entry
Lava flow hazards of Mauna Loa eruptions
Fissure eruptions from dikes intruded
into rift zone (1950, 1975, 1984).
.
Lava flow hazards of Mauna Loa eruptions
Fissure eruptions from dikes intruded
into rift zone (1950, 1975, 1984).
.
1950 eruption
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based on ~60 SAR images
http://hvo.wr.usgs.gov/maunaloa/history/50_06_01/
M6.5(?) quake:
first vent (eruption start):
downrift vent:
ocean reached:
May 29, 3:17 pm
May 31, 9:25 pm
June 1 10:15 pm
June 2 1:05 am
1950 eruption time line:
3 hours for lava to reach the ocean !
You are here !
1950 ocean entry
The 1950 flow took only 3 hours from eruption initiation to ocean entry. A repeat could lead to disaster.
The eruption waspreceeded 2 days by a M6.5 quake
Lava flows from Mauna Loa threaten developments
along the coast
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KDP-B DPMC 2-26
The Hawaiian Volcanoes: Rift intrusion and decollement motion
Photos: HVO
The modes of deformation: rift intrusion seismic/aseismic decollement
slip flank motionmagma chamber
inflation/deflation
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Mauna Loa, Hawaii, 2014-2017 unrest periodLOS displacement from 110 Cosmo-Skymed images
GPS
InSAR
PAT3 ALAL
PHANSLPC
MLSP
MOKP
west
east
Ground deformation during 2013-2017 unrest period:- 15 cm LOS decrease (uplift)- 20 cm flank motion
unrest period started with east flank motion
flank motion
-4 40
LOS velocity (cm/yr)
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Mauna Loa, HawaiiLOS displacement from 110 Cosmo-Skymed images
GPS
InSAR
PAT3 ALAL
PHANSLPC
MLSP
MOKP
west
east
unrest period started with east flank motion
-4 40
flank motion
LOS velocity (cm/yr)
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- Dike-like magma body- Mogi source- Slip along eastern decollement
Mauna LoaSource Model
No slipalong
western decollement!
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Coulomb stress changesAlong decollement due to magma source Along rift due to decollement slip
Feedback between dike inflation and decollement slip:- dike inflation encourages decollement slip- decollement slip encourages dike inflation
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Temporal Variation
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Is dike inflation variable with time?
GPS positions as as a function of time
- Little motion in West
- Change in Aug-Sep 2016
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Southward propagation of dike in Sep 2015
East-west displacement from combining ascending and descending imagery
x
x
x
x
max horizontaldisplacement
2014-2015
2015-2017
1.5 km motion of max. displace-ment location
• Inflating dike is located 1.5 km further south during later time period• southward motion is predicted by stress change models
Forecast:There will be additional southward motion of the dike-like magma body and eventually it will erupt from the southflank
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Summary