Sebuah gempa cukup besar (7.0 Mw, 6.9 SR) baru saja terjadi (pukul 14.38 WIB)
di wilayah perairan Sumatra Barat dan menggoncang wilayah di sekitarnya,
terutama Provinsi Sumatra Barat. Kedalaman gempa yang dilaporkan BMG (data
sementara) adalah 38 km, meskipun menurut data sementara USGS kedalaman fokus
gempa 50,8 km (seperti data detail di bawah).
Secara tektonik, episentrum gempa tepat berlokasi di sesar dextral Mentawai
Fault, di sebelah timur Pulau Siberut, pada perairan forearc basin. Momen
tensor solution sampai tulisan ini dibuat belum tercantum di data USGS;
kemungkinan besar merupakan pemetahan mendatar sebagaimana sesar regionalnya.
Kerusakan yang terjadi dan korban belum diketahui.
Earthquake Details (USGS)
Magnitude 7.0
Date-Time Sunday, August 16, 2009 at 07:38:26 UTC
Sunday, August 16, 2009 at 02:38:26 PM at epicenter
Time of Earthquake in other Time Zones
Location 1.409°S, 99.494°E
Depth 50.8 km (31.6 miles)
Region KEPULAUAN MENTAWAI REGION, INDONESIA
Distances 110 km (65 miles) WSW of Padang, Sumatra, Indonesia
305 km (190 miles) SW of Pekanbaru, Sumatra, Indonesia
560 km (345 miles) SSW of KUALA LUMPUR, Malaysia
960 km (600 miles) WNW of JAKARTA, Java, Indonesia
Location Uncertainty horizontal +/- 7.5 km (4.7 miles); depth +/- 13.9 km (8.6
miles) Parameters NST= 54, Nph= 54, Dmin=683.7 km, Rmss=1.03 sec, Gp= 40°,
M-type=teleseismic moment magnitude (Mw), Version=7
Source USGS NEIC (WDCS-D)
Kemungkinan tsunami kecil menurut NOAA, tetapi itu berdasarkan historic data.
Diharapkan pejabat setempat mewaspadai, terutama di radius 100 km dari
episentrum gempa ke arah Pulau Sumatra.
TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 0749Z 16 AUG 2009
THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.
... TSUNAMI INFORMATION BULLETIN ...
THIS MESSAGE IS FOR INFORMATION ONLY.
THIS BULLETIN IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES. ONLY
NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE
DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND
ANY ACTIONS TO BE TAKEN IN RESPONSE.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0738Z 16 AUG 2009
COORDINATES - 1.6 SOUTH 99.4 EAST
LOCATION - SOUTHERN SUMATRA INDONESIA
MAGNITUDE - 6.9
EVALUATION
A DESTRUCTIVE WIDESPREAD TSUNAMI THREAT DOES NOT EXIST BASED ON
HISTORICAL EARTHQUAKE AND TSUNAMI DATA.
HOWEVER - THERE IS A VERY SMALL POSSIBILITY OF A LOCAL TSUNAMI
THAT COULD AFFECT COASTS LOCATED USUALLY NO MORE THAN A HUNDRED
KILOMETERS FROM THE EARTHQUAKE EPICENTER. AUTHORITIES IN THE
REGION NEAR THE EPICENTER SHOULD BE MADE AWARE OF THIS
POSSIBILITY.
salam,
Awang
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