seismicity pattern of pakistan and surrounding...
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Seismicity Pattern of Pakistan and Surrounding Areas
Pakistan Meteorological Department National Seismic Monitoring Network, Islamabad
Dated: 5th January2016
PMD
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Mw 7.6,
2005
Depth
Islamabad
Northern Areas
8th October, 2005 Kashmir Earthquake Mw 7.6
and Aftershocks Distribution
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26th Oct. 2015
Mw 8.1,
7th Dec. 2015
Mw 7.2
25th Dec. 2015
Mw 6.8
Tajikistan
Pakistan
26th October, 2015 Hindukush Region Earthquake Mw 8.1
and Aftershocks Distribution
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543
754
675
771
848
0
100
200
300
400
500
600
700
800
900
2011 2012 2013 2014 2015
Last Five Years Frequency of Earthquake in and around Pakistan
Years
No of
earthquakes
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General Seismicity Pattern of Pakistan & Surrounding Areas
A Brief Seismicity Analysis of Pakistan & surroundings:
1900-2015
4.0 to 4.9 64% of the total events,
25% from 3.0 to 3.9 and
9% from 6.0 to 6.9
Only 150 events with magnitude ≥ 6.0
28 events with magnitude range 7.0 to 7.9
Only 3 events have magnitude ≥ 8.0
Quetta
Gwadar
Arabian sea
Awaran
Karachi
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Historical Earthquakes of Pakistan
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MBT
Tadik basin
Seismicity Pattern in Hindukush Region
Tajikistan
Pakistan
Afghanistan
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HK region
Sou
rce m
ech
anism
pattern
in H
ind
uku
sh R
egio
n an
d
surro
un
din
gs
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Depth Profile of Hindukush Region
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Dep
th (
km)
Magnitude
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Part – 2 General Seismicity Pattern of
Pakistan
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Seismicity Trend Analysis over Active Faults in
Hazara-Kashmir Syntaxis
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Islamabad
Himalaya Range
Main Boundary Thrust
Mw 7.6 2005
Active Faults and Source Mechanism of Earthquakes ( 1970 – 2015 , M > 5.5 )
Depth
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Islamabad
Main Boundary Thrust
M 5.3 2015
Depth Mag
M ≥ 5
M 4 – 4.9
M below 4
Seismicity and Active Faults Near Islamabad
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Future Large Earthquake Probability
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Earthquake Frequencies for M = 4 – 4.9
Earthquake Frequencies for M = 5 – 5.9
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‘a’ and ‘b’ value comparison on yearly basis between 2001 – 2015
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Conclusion – 1
The Hazara/Kashmir Syntaxis
• Over all there is an increasing trend in Hazara-Kashmir Syntaxis area since last five years.
• Frequency of intermediate rang events increased,
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Seismicity in Main Mantle Thrust and
Nanga Parbat, Haramosh area
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The Tectonic Map of the Area
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Seismicity of the Region
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Only one earthquake
occurred on 2002
with Magnitude
range 5.1-6.0
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Conclusion – 2
The Main Mantle Thrust and Nanga Parbat Haramosh
Syntaxes
This area has potential of intermediate range
seismic activities (3.1-4.0).
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Seismicity Trend in the Region of Salt Range
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MAIN FAULTS IN THE REGION
• Kalabagh Fault
(North South)
• Jhelum Fault
(North South)
• Salt range thrust fault
(East-West)
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Seismicity of Salt Range
Kal
abag
h F
ault
Jhel
um
Fau
lt
Salt range thrust fault
Chakwal
Mangala
Talagang
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Salt Range Events Frequency
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EARTHQUAKE FREQUENCY TREND WITH RESPECT TO MAGNITUDE
FOR THE PERIOD 1975-2015
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
5/7
/75
2/9
/80
12
/27
/84
2/1
2/9
1
5/3
1/9
2
12
/8/9
5
4/2
8/9
9
1/2
2/0
5
3/1
0/0
6
2/2
2/0
7
5/1
/10
15
/05
/20
10
2/7
/10
23
/08
/20
10
27
/09
/20
10
15
/11
/20
10
26
/11
/20
10
31
/01
/20
11
18
/02
/20
11
11
/4/1
1
24
/05
/20
11
30
/06
/20
11
23
/08
/20
11
24
/10
/20
11
7/1
9/1
1
1/2
2/1
2
2/2
/12
3/3
/12
13
/03
/20
12
28
/05
/20
12
27
/07
/20
12
18
/08
/20
12
11
/10
/12
26
/12
/20
12
4/1
/13
1/2
/13
9/4
/13
6/8
/13
1/1
0/1
3
5/1
1/1
3
3/2
6/1
4
22
/01
/20
14
17
/02
/20
14
25
/03
/20
14
13
/04
/20
14
28
/06
/20
14
24
/08
/20
14
Mag
nit
ud
e
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Conclusion – 3
The Region of Salt Range
1. Over all Earthquake occurrence frequency trend is same.
2. Area representing the moderate seismicity
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Way forward
I. The risk of earthquakes has significantly increased due to the urbanization. A big
earthquake hitting a densely populated city could have devastating impacts.
Besides existing earthquake monitoring network, a dense network will be required
particularly for Northwest, northeast and southwest areas of Pakistan.
II. Earthquake Early warning system is recommended for Northwest, northeast and
southwest areas.
III. Increase the local capacity of earthquake prone areas for disaster resilience with
series of training workshops for regarding MEASURES TO MINIMIZE THE EFFECTS
OF AN EARTHQUAKE.
IV. For disaster Reduction planning is the best way for a more community to move
toward Disaster Resilience.
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Thanks
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Arabian Sea
India
China
Pakistan
Tajikistan
Russia
Iran
Saudi Arabia
USGS
PMD
BB Stations
Local and International Broadband Stations Network
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34
Magnitude and Intensity
• MAGNITUDE
– Measure of earthquake size (energy)
– Quantitative measure
– Source Parameter
– Remains same everywhere
• INTENSITY
– Measure of the destruction caused by an earthquake
– Qualitative measure
– Site parameter
– Different at different places (Attenuation and amplification phenomena)
– Most commonly used intensity scale is “MMI or Modified Mercalli Intensity Scale.
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Hindukush (Afghanistan) Earthquake 35
Magnitude and Intensity
• DIFFERENCE BETWEEN MAGNITUDE & INTENSITY – Magnitude remains unchanged with distance from the earthquake.
Intensity decreases with distance from the earthquake epicenter.
– Magnitude measurement requires instrumental monitoring for its
calculation, however, assigning an intensity requires a sample of the felt
responses of the population.
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Hindukush (Afghanistan) Earthquake 36
Different Magnitude Scales
Earthquake Magnitude
Richter Local Magnitude
Surface Wave Magnitude
Ms = log A + 1.66 log + 2.0
Body Wave Magnitude
mb = log A – log T + 0.01 + 5.9
Other Instrumental Magnitude Scales
MC , MD , MJMA
Moment Magnitude (preferred)
Mw = (log Mo)/1.5 – 10.7