Arabia Shakes
Posted by feww on November 5, 2009
Arabian Plate Jolted by Quake Cluster at Boundaries in Gulf of Aden
As of posting 4 events had occurred in the region, the largest of which is estimated at 5.8 Mw. The events occurred at a depth of about 10 km.
A Wave of Intense Seismicity May Break up Arabian Plate!
In your lifetime you could see large earthquakes and volcanic explosions breaking up the Arabian plate, creating one or more islands from its southern half.
Arabian Plate. Image Credit: Saudi Arabian Geological Survey
The western boundary of the Arabian plate is a transform fault zone — the Dead Sea and East Anatolian faults —where the adjacent plates grind past each other. Rifts of the Red Sea and Gulf of Aden constitute the southern boundary, where Arabia and Africa are pulling apart. The Zagros and Makran mountain ranges mark the present collision zone. Blocks north and east of the collision zone (the Lut and Helmand blocks) arrived on the shores of Eurasia much earlier and are being jostled about during the current event … — Tectonics of the Arabian Plate/ Johnson Space Center/NASA
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The GFZ Potsdam Earthquake Bulletin reported the events as follows
Event No. 1
Region: Western Gulf of Aden
Time: 2009-11-05 06:23:05.2 UTC
Magnitude: 4.4
Epicenter: 45.70°E 12.21°N
Depth: 10 km
Status: manually revised
Earthquake Location Map. © Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum – GFZ
Event No. 2
Region: Western Gulf of Aden
Time: 2009-11-05 07:12:35.7 UTC
Magnitude: 5.6
Epicenter: 46.07°E 12.10°N
Depth: 20 km
Status: manually revised
Tectonics of the Arabian Plate
The African, Arabian and Indian crustal plates have been marching northward to collide with Eurasia — for about 20 million years in the case of Arabia, and for 50 million years in the case of India. The result has been a collage of plate pieces and mountain ranges that extend from the Pyrenees in the west, across southern Europe and the Middle East, through the Himalayas and the ranges of southeast Asia. Incorporated within that broad band are continental fragments that moved across the ocean and separately crashed into Eurasia; structures of some of those fragments have been reactivated during the present collision. Image and Caption: Johnson Space Center/NASA
10-degree Map Centered at 10°N,45°E
Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW
Seismic Hazard Map
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Seismic Hazard Map
Event No. 3
Region: Western Gulf of Aden
Time: 2009-11-05 07:57:30.1 UTC
Magnitude: 4.8
Epicenter: 46.11°E 11.96°N
Depth: 10 km
Status: manually revised
Event No. 4
Region: Western Gulf of Aden
Time: 2009-11-05 08:05:52.6 UTC
Magnitude: 5.1
Epicenter: 45.95°E 12.13°N
Depth: 17 km
Status: manually revised
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claudia said
You should tell me were convergent place boundry occur