NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
One Century of Tectonic Deformation Along the Sumatran Fault from Triangulation and GPS SurveysAn analysis combining historical triangulation and recent Global Positioning System (GPS) survey measurements in West and North Sumatra, Indonesia, reveals a detailed slip history along the central part of the Sumatran Fault. The arc-parallel components of the combined velocity field are consistent with slip rates inferred from GPS data, ranging from 23 to 24 mm/yr. Between 1.0 S and 1.3 N the Sumatran Fault appears to be characterized by deep locking depths, on the order of 20 km, and the occurrence of large (M (sub w) approximately 7) earthquakes. The long-term (1883-1993) strains show simple right-lateral shear, with rates similar to GPS-measured, 1989-1993 strain rates. Coseismic deformation due to the 1892 Tapanuli and 1926 Padang Panjang earthquakes, estimated from triangulation measurements taken before and after the events, indicate that the main shocks were significantly larger than previously reported. The 1892 earthquake had a likely magnitude of M (sub w) approximately equal to 7.6, while the 1926 events appear to be comparable in size to the subsequent (M approximately 7) 1943 events, and an order of magnitude higher than previously reported.
Document ID
20000064068
Acquisition Source
Headquarters
Document Type
Preprint (Draft being sent to journal)
Authors
Prawirodirdjo, L. (Scripps Institution of Oceanography La Jolla, CA United States)
Bock, Y. (Scripps Institution of Oceanography La Jolla, CA United States)
Genrich, J. F. (Scripps Institution of Oceanography La Jolla, CA United States)
Puntodewo, S. S. O. (Badan Koordinasi Survey dan Permetaan Nasional Cibinong, Indonesia)
Rais, J. (Badan Koordinasi Survey dan Permetaan Nasional Cibinong, Indonesia)
Subarya, C. (Badan Koordinasi Survey dan Permetaan Nasional Cibinong, Indonesia)
Sutisna, S. (Badan Koordinasi Survey dan Permetaan Nasional Cibinong, Indonesia)
Date Acquired
September 7, 2013
Publication Date
May 4, 2000
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NSF EAR-90-04376
CONTRACT_GRANT: NAGW-2641
CONTRACT_GRANT: NSF EAR-88-17067
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available