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A moderate
earthquake (M5.0 to 5.9 termed as "moderate") occurred
in the Siahan ranges between the towns of Washuk and Pishuk
on 10 August 2011
at 05:53 AM local time in in Pakistan. It had a magnitude of Mw=5.8
and is known to have caused some damage in the epicentral region.
The earthquake was centred
25 kms E of Washuk (Baluchistan), Pakistan,
31.4 kms WNW of Pishuk (Baluchistan), Pakistan,
62 kms NE of Mughalgor (Baluchistan), Pakistan,
104 kms SSW of Kharan (Baluchistan), Pakistan,
120 kms NE of Panjgur (Baluchistan), Pakistan,
152 kms W of Khuzdar (Baluchistan), Pakistan,
146 kms SSE of Dalbandin (Baluchistan), Pakistan,
339 kms SSW of Quetta (Baluchistan), Pakistan,
372 kms NW of Karachi (Sindh), Pakistan.
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Mud houses in the town of Khuzdar
were damaged in this earthquake. Many people ran outdoors in fear
reciting the Kalma-e-Tayaba. Shaking was felt in
several parts of Baluchistan including at Dalbandin, Kalat, Khuzdar, Sibi,
Quetta and Washuk in Baluchistan. In upper Sindh it was felt at
Shahdadkot. Mild tremors were also felt in lower Sindh by a few people
in Clifton, Defence, Kharadar, Korangi, North Karachi, Landhi and Sadar in
Karachi.
This is the largest
earthquake in Baluchistan since a Mw 7.2 earthquake struck
near the town of Dalbandin in January 2011.
The USGS and GFZ centroid moment tensor solutions for the event on 10 August
2011
indicate the greatest seismic moment release occurred on a normal
fault with a strike-slip component. The predominantly normal
faulting mechanism of this earthquake along with its depth suggests
that it might have occurred either within the subducting Arabian
Plate or within the over-riding Eurasian Plate.
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References
01)
National
Earthquake Information Centre (PDE),
Golden, USA.
02)
Geo Forschungs Zentrum,
Potzdam (GFZ), Germany.
03)
Macroseismic information has been compiled by the ASC from
reports by local media and local NGO personnel.
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