Skip to main navigationSkip to main content
The University of Southampton
Ocean and Earth Science, National Oceanography Centre Southampton

Research project: Active-source seismic refraction across the Sumatra subduction zone

Currently Active: 
Yes

Historic earthquakes have ruptured distinct segments of the plate boundary megathrust at the Sumatra subduction zone. We use seismic refraction data to derive a velocity model for a  3-D area crossing the plate boundary near Nias and Siberut (Fig. 1). Seismic refraction datasets can shed light on factors controlling rupture segmentation [e.g., Tang et al., 2013].

Project Overview

Objectives

  • Determine the structure and velocities across the areas that ruptured in the 2005 Mw 8.7, 1935 Mw 7.7, and 1797 Mw ~8.7-8.9 earthquakes.
  • Compare velocity structure from different rupture segments and in the transition zones between them.
  • Test hypotheses regarding the causes and processes of segmentation and rupture of megathrusts.
Figure 2
Figure 2
Figure 1
Figure 1

3-D seismic refraction data

3-D refraction data were recorded in 2008 from Nias to Siberut on 47 ocean-bottom seismometers (OBS) using an air gun source (Fig. 2). The area covered was approx. 300 km by 200 km, and 8,400 air-gun shots were fired along the profiles. P-wave first arrival refractions were picked from the OBS data and will be inverted to give a velocity model.

Key Contacts

Prof. Timothy Henstock

Prof. Lisa McNeill

Prof. Jonathan Bull

Dr. Marianne Karplus

PhDs and Other Opportunities

Please visit GSNOCS

Related research groups

Geology and Geophysics

Publications

Key Publication

Staff

Share this research project Share this on Facebook Share this on Google+ Share this on Twitter Share this on Weibo

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×