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M5.0 Sasan Gir National Park Earthquake, 2011

Date:

20 October 2011

Epicentre:

W of Sasan Gir, Junagadh

Time:

22:48:25 IST (17:18:25 UTC)

Latitude:

21.181 N (PDE)

Longitude:

70.540 E (PDE)

Depth:

15.5 kms (PDE)

Magnitude:

Mw=5.0 (GFZ); Mb=5.0 (PDE)

Additional Info


Map Disclaimer


A moderate earthquake (M5.0-5.9 termed as "moderate") occurred in the Gir National Park region in Gujarat's Saurashtra region, India, on 20 October 2011 at 22:48 PM local time in India. It had a magnitude of Mw=5.0 and was widely in the Kathiawar peninsula as well as far as Mumbai. 34 people were hurt and considerable damage occurred in Junagadh district.
 

Aftershock advisory: Given the magnitude of this earthquake it would be reasonable to expect aftershocks in the M3.5-4.0 range that could cause additional damage to structures weakened in the mainshock. Aftershocks decay in magnitude and frequency with respect to the time elapsed since the mainshock. Thus the probability of these occurring reduces with time. That said, please bear in mind, large aftershocks can occur several weeks or months following the mainshock.

Numerous aftershocks have been recorded by the seismological network run by ISR Gandhinagar including a M4.1 aftershock at 09:37 AM IST (03:07 UTC) on 21 October 2011 that was strongly felt in the Talala region. Another significant ML=4.3 aftershock occurred on 12 November 2011 and was felt in several parts of the Kathiawar peninsula.


This earthquake was centre
d 6 kms W of Sasan Gir (Junagadh, Gujarat), India,
20 kms SSE of Mendharda (Gujarat), India,
36.5 kms NE of Veraval (Gujarat), India,
39.3 kms S of Junagadh (Gujarat), India,
64 kms S of Dhoraji (Gujarat), India,
110 kms SE of Porbandar (Gujarat), India,
128 kms S of Rajkot (Gujarat), India,
236 kms E of Surat (Gujarat), India,
294 kms SW of Ahmedabad (Gujarat), India
344 kms NW of Churchgate, Mumbai (Maharashtra), India.

If you felt this earthquake please click here to view a felt map and to fill out a report.

At least 34 people were injured in the epicentral region in the Maliya Hatina-Talala talukas in Junagadh district. One person was also hospitalised after jumping out of a building in Junagadh. Four people were hurt after jumping out of the upper floors of buildings in Talala.

At least 144 buildings were heavily damaged or partially collapsed Ladudi Gir (134) and at Jalandhar Gir (10). In total, 876 buildings were damaged in the four villages of Babra Gir, Devgam, Jalandhar Gir and Ladudi Gir. Buildings were also damaged at Dharampur Gir, Khorasa Gir and Maliya Hatina. At least 2,500 buildings sustained minor damage in the town of Talala alone including the Palika Sadan, library and the old Palika Bhavan. A building in Veraval also developed cracks.

Strong tremors were felt in the Sasan Gir National Park region where people ran outdoors. In this region it was strongly felt at Borvav Gir, Chitravad, Dhanej, Galivad Gir, Hiranvel, Jaypur, Khirdhar and Sangodhara. It was also felt strongly in Junagadh, Talala and Vanthali where there was panic. Power supply was cut to parts of Junagadh district immediately after the earthquake including Manavadhar, Talala, Vanthali and Veraval. The mobile network was jammed in many places after the earthquake in the Junagadh-Veraval area. In Bhavnagar and Rajkot, people were woken up and went outdoors. Tremors were felt throughout the Kathiawar peninsula including in Amarna, Amodra, Amreli, Babra, Babasara, Bhatia, Botad, Damnagar, Dhandhuka, Dhrol, Dhoraji, Diu, Dwarka, Gadhada, Gariadhar, Gondal, Jaffrabad, Jaitpur, Jamnagar, Jasdan, Jodiya, Keshod, Khambalia, Kodinar, Mahuwa, Manekwada, Mangrol, Morbi, Palitana, Porbandar, Rajula, Savarkundla, Shergarh, Shihor, Somnath, Sutrapada, Tankara, Umrana, Una, Upleta, Valabhipura, Visavadar and Wankaner. It was also felt in the Gohilwad area.

Tremors were felt in parts of Kachchh, south Gujarat and in the Ahmedabad-Surendranagar region. In Kachchh, tremors were felt on the upper floors of buildings at Bhuj, Bhachau, Mandvi, Mundra, Kandla and Rapar. In Ahmedabad, people living in multi-storied buildings in the Kalol, Maninagar, Memnagar, Navrangpura, New Palodia, New Ranip, Paldi, Satellite and Vastrapur areas went outdoors. Strong tremors were felt at Bharuch. In Vadodara it was mainly felt in the upper floors of multi-storied buildings especially in the Fatehgunj, Kareibaug and Manjalpur. However, this earthquake was not felt in Dahod, Godhra or Rajpipla. This earthquake was felt in multi-storied buildings in the city of Surat including at Adajan, City Light, Gopipura, Ichanath, Katargram, Nanpara, Navsari Bazaar, Pal, Parle Point, Piplod, Randher, Salabatpura, Udhana, Varachha and Vesu where people went outdoors. Elsewhere in south Gujarat, tremors were felt at Bardoli, Bilimoria, Gandevi, Kharel, Olapad, Valsad, Vapi and Vyara. People went outdoors at Bardoli and Navsari. Mild tremors were felt in tall buildings in some parts of the Mumbai metropolitan region such as Borivali, Juhu, Kandivili, Mahim, Nalasopara and Vasai.

This is the strongest earthquake here since two similar sized earthquake in November 2007. The moment tensor solution (below) indicates a predominanantly strike-slip mechanism for this earthquake.

GFZ Event gfz2011uove
11/10/20 17:18:31.65
Southern India
Epicenter: 20.977 70.359
MW 5.0

GFZ MOMENT TENSOR SOLUTION
Depth  10         No. of sta: 23
Moment Tensor;   Scale 10**16 Nm
  Mrr=-0.82       Mtt=-3.13
  Mpp= 3.95       Mrt=-1.11
  Mrp=-0.92       Mtp=-3.13
Principal axes:
  T  Val=  4.34  Plg=12  Azm=100
  N       -0.70      67      220
  P       -3.64      20        6

Best Double Couple:Mo=4.0*10**16
 NP1:Strike=144 Dip=67 Slip=-173
 NP2:        52     85       -22
           ------ P --           
        ---------   -----        
     ##---------------------     
    ###----------------------    
  ######--------------------###  
  ######------------------#####  
 ########---------------######## 
#########-------------###########
##########----------#############
###########-------###############
############----#################
#############-###################
 ##########----################# 
  #######--------##############  
  ####-------------############  
    -----------------########    
     -------------------####     
        -----------------        
           -----------           

References
01) National Earthquake Information Centre (NEIC/PDE), Golden, USA.
02)
Institute of Seismological Research (ISR), Gandhinagar, India.
03) India Meteorological Department (IMD), Delhi.
04)
Geo Forschungs Zentrum (GFZ), Potzdam, Germany.
05) Macroseismic information has been compiled by the ASC from reports by local media and local NGO personnel.

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International boundaries of India (especially Arunachal Pradesh, Jammu & Kashmir, Himachal Pradesh and Uttarakhand) on the displayed map are from Google Maps. These do not conform to the external boundaries of India recognized by the Survey of India. That they are displayed on this page via Google Maps, is only for display purposes and this should not be misinterpreted as an endorsement of these boundaries by the Amateur Seismic Centre (ASC).

Page Updated: 13 Nov 2011 | Website Disclaimer

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