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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.
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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 centred
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
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