Monitoring of the Palu-Koro Fault (Sulawesi) by GPS

Details Monitoring of the Palu-Koro Fault (Sulawesi) by GPS Monitoring of the Palu-Koro Fault (Sulawesi) by GPS

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2313w&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 13, p. 2313-2316

Physics

8

Geodesy And Gravity: Space Geodetic Surveys, Geodesy And Gravity: Crustal Movements-Interplate, Information Related To Geographic Region: Asia

Scientific paper

5 years of GPS measurements across the Palu-Koro fault (Sulawesi, Indonesia) state left lateral strike-slip (3.4 cm/yr) with a small normal component (0.4 cm/yr). The measurements on intermediate points of the transect show that the fault is locked, at a depth estimated around 8-16 km by a very simple model. The best measured baseline linking the two most separate sites (Watatu and Toboli) shows very interestingly a constant rate of 2.6 cm/yr from 1992 to 1995, and an increased rate of 6.3 cm/yr since then. This increase is due to an earthquake on January 1, 1996 in the Minahasa trench, presumably affecting station Toboli's position by 2 cm of co-seismic and 2 cm of post-seismic displacement, which is added to its long term velocity. We interpret this phenomenon as additional stress loading on the Palu fault, driven by the slip during the earthquake 100 km to the North-East.

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