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A major earthquake
(pink star) struck the southern Mentawai Strait on 13 September
2007 at 06:49 AM local time in Sumatra, Indonesia. This earthquake
had a magnitude of Mw=7.9 and was strongly felt in many parts of
the region including as far a field as Singapore. It came barely 24-hours after a
great earthquake of magnitude Mw=8.4
(red star) occurred in the same region immediately to the south.
It was followed by another major earthquake of magnitude Mw=7.0
(yellow star) to the north-west of its epicentre and also in the
immediate region at 10:35 AM local time in Sumatra.
Preceeding Event :
12 Sep
2007, Mw=8.4 South Mentawai Strait-Bengkulu Earthquake
The earthquake was
centred
7.7 kms NW of Talangarah (Sumatra), Indonesia,
35.9 kms NNW of Seblat (Sumatra), Indonesia,
62.2 kms SE of Mukomuko (Sumatra), Indonesia,
76.5 kms WNW of Muaramman (Sumatra), Indonesia,
126 kms NW of Bengkulu (Sumatra), Indonesia,
260 kms SE of Padang (Sumatra), Indonesia,
273 kms SW of Jambi (Sumatra), Indonesia,
500 kms NW of Tanjung Telukbetong (Sumatra), Indonesia,
545 kms SW of Changi International Airport, Singapore,
692 kms NW of Jakarta (Java), Indonesia.
This earthquake
struck in the southern Mentawai Straits as well as adjacent parts of
Bengkulu, Jambi and Sumatera Barat provinces province on Sumatra
just to the north of a Mw=8.4 event that struck the same region
the previous day. This earthquake was strongly felt in many parts
of Sumatra. Damage was reported in Jambi province. However, it is unclear which of the
three earthquakes were responsible for this damage. The Major
General A. Thalib Hospital was damaged at Sugainpenuh while
elsewhere in the Kerinci district, damage to buildings was
reported from the districts of Keliling Danau, Danau Kerinci and
Siulak. At Padang, patients
were evacuated to makeshift tent in the open at the Dr. M. Jamil
Hospital, Reksodiwiryo Hospital and Yos Sudarso Hospital in the
city after buildings developed cracks.
Across the
Malacca Straits, this earthquake was felt in Malaysia. At Penang
it was felt in high-rise buildings at places such as Jalan Sultan Ahmed Shah and Downing
Street while in the capital, Kuala Lumpur, it was felt at Jalan
Ampang, Jalan Tun Abdul Razak and Lembah Pantai. In Malaka/Malacca,
it was felt at Ujong Pasir where it is believed nearly a 1000
residents of a 13-storey condominium rushed outdoors. Tremors were not
felt at the Petronas Towers in Kedah in the city. In Singapore, it was felt in high-rise buildings
throughout the nationstate including in the Central Business
District, Clementi, Jurong, Hougang, Punggol, Toa Payoh and
Woodlands
Tsunami advisories
were issued for Australia, Indonesia, Malaysia, Thailand and
Singapore as a result of this earthquake but were later lifted.
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References
01)
International Seismological Centre (ISC),
London.
02)
National
Earthquake Information Centre (NEIC), Golden, USA.
03)
Harvard Centroid Moment Tensor Solution (HRV), Harvard, USA.
04)
Macroseismic information has been compiled by
the ASC from reports by local media and local NGO personnel.
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