FAST TRACK PAPER: Evidence of active backthrusting at the NE Margin of Mentawai Islands, SW Sumatra

Details FAST TRACK PAPER: Evidence of active backthrusting at the NE Margin of Mentawai Islands, SW Sumatra FAST TRACK PAPER: Evidence of active backthrusting at the NE Margin of Mentawai Islands, SW Sumatra

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.180..703s&link_type=abstract

Geophysical Journal International, Volume 180, Issue 5, pp. 703-714.

Astronomy and Astrophysics

Astronomy

8

Tsunamis, Seismicity And Tectonics, Subduction Zone Processes, Continental Margins: Convergent, Submarine Landslides

Scientific paper

The Indo-Australian plate subducts obliquely beneath the Sunda plate leading to a slip partitioning into pure thrust and strike-slip motion. Just in the last 5 yr, three pure thrust earthquakes of Mw > 8.4 have occurred along this subduction interface. The Great Sumatra Fault, traversing the Sumatra continental block, takes up a significant part of the strike-slip motion, but the Mentawai Fault bounding the NE margin of Mentawai Islands has been suggested to accommodate a part of the strike-slip motion. Although the great Sumatra Fault is active, no seismicity has been observed along the Mentawai fault. Using a combination of high-resolution seismic reflection and bathymetry data, here we show that the Mentawai Fault seems to be characterized by active SW dipping backthrusts. The presence of recent steeply dipping thrust earthquakes suggests that these faults should be active. Combined with results from north in 2004 earthquake region and south of this study area, our results suggest that backthrusting should play an important role in forearc evolution SW of Sumatra. We also observed several mass wasting sites at NE margin of the Mentawai Islands, which could be erosional features or landslides triggered by earthquake activities. Localized uplift along the steeply dipping backthrusts at the NE margin of Mentawai Islands in the fully locked region could pose serious seismic and tsunami risks to the SW coast of Sumatra in the future.

Affiliated with

Also associated with

No associations

Rating

FAST TRACK PAPER: Evidence of active backthrusting at the NE Margin of Mentawai Islands, SW Sumatra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with FAST TRACK PAPER: Evidence of active backthrusting at the NE Margin of Mentawai Islands, SW Sumatra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FAST TRACK PAPER: Evidence of active backthrusting at the NE Margin of Mentawai Islands, SW Sumatra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1091323