Strong Quakes Strikes Bhutan

Magnitude 6.1 [possibly 6.4] Earthquake Strikes East of Thimphu, Bhutan

Strong earthquake measuring 6.1 to 6.4 Mw struck Bhutan 135 km NNW of Gauhati, Assam, India

Bhutan is a small landlocked country located at the eastern end of the Himalaya Mountains in South Asia, bordered by India  (south, east and west) and China (north).

The quake caused landslides blocking roads to mountanous regions, killing about a dozen people and destroying a few homes and a monstary in the nearby Tashigang district, according to media reports.

The quake was felt in Assam state, NW India, which borders Bhutan, but there were no reports of damage there, as of posting.

Map of Bhutan with the approximate position of the EQ marked.

Summary from: European-Mediterranean Seismological Center
Magnitude: Mw 6.4
Region: BHUTAN

Date time: 2009-09-21 at 08:53:06.0 UTC
Location: 27.47 N ; 91.48 E
Depth: 10 km
Distances:

• 45 km NW Guwahati (pop 899,094 ; local time 14:23 2009-09-21)
• 99 km NW Tangla (pop 17,724 ; local time 14:23 2009-09-21)
• 12 km S Trashiyangtse (pop 3,025 ; local time 14:53 2009-09-21)

EQ Details:  GFZ Potsdam – Earthquake Bulletin
Region: Bhutan
Time: 2009-09-21 08:53:06.3 UTC
Magnitude: 6.1
Epicenter: 91.46°E 27.34°N
Depth: 18 km
Status: manually revised

10-degree Map Centered at 25°N,90°E

EQ Location Map. Original map: USGS

Source of EQ Data: USGS NEIC (WDCS-D)

Magnitude: 6.1
Date-Time:

• Monday, September 21, 2009 at 08:53:05 UTC
• Monday, September 21, 2009 at 02:53:05 PM at epicenter

Location: 27.352°N, 91.424°E
Depth:  10 km (6.2 miles)
Region: BHUTAN
Distances:

• 135 km (85 miles) NNW of Gauhati, Assam, India
• 180 km (110 miles) E of THIMPHU, Bhutan
• 615 km (380 miles) NNE of Kolkata (Calcutta), West Bengal, India

Location Uncertainty:  horizontal +/- 6.1 km (3.8 miles)
Parameters NST=134, Nph=134, Dmin=>999 km, Rmss=1.02 sec, Gp= 22°, M-type=teleseismic moment magnitude (Mw), Version=8

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