Biak earthquake aftershocks (17-Feb-1996) (BIAK)
| Contact: |
Rob McCaffrey |
| E-mail: | |
| Phone: | +1 518 276-8521 |
| Fax: | +1 518 276-6680 |
| Address: | Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy NY 12180-3590, U.S.A. |
| Status: | Not reporting |
| Last data: | 1996-04-05 |
| Web page: | |
| Publications: | |
| Description: | Following the M=8.2 Biak quake, we monitored aftershocks for 3 weeks using the PASSCAL RAMP seismographs, and re-occupied a GPS network. The GPS site in S Biak moved over 1 meter to the NNE while the Yapen site moved about 20 cm NNW. We also measured the subsidence of Biak Island by looking at changes in the high-tide marks. Parts of the NE side of the island subsided by 2 meters while the S and W sides dropped by less than 1 meter. The large gradients in subsidence to the south and west suggest that the S edge of the rupture zone was beneath N Biak Island. See the subsidence map and dislocation model. The horizontal and vertcal coseismic displacements can be explained by either a gently, S-dipping fault or a steep, N-dipping fault. The well-located aftershocks will tell the difference, but that work is in progress. The EDR aftershocks suggest that the S-dipping plane ruptured. |
| Original data contributed to ISC: |
To update this information, please contact: dco isc.ac.uk |
