TY  - JOUR
A1  - Bookhagen, Bodo
A1  - Echtler, Helmut Peter
A1  - Melnick, Daniel
A1  - Strecker, Manfred
A1  - Spencer, Joel Q. G.
T1  - Using uplifted Holocene beach berms for paleoseismic analysis on the Santa Maria Island, south-central Chile
N2  - Major earthquakes ( M > 8) have repeatedly ruptured the Nazca-South America plate interface of south-central Chile involving meter scale land-level changes. Earthquake recurrence intervals, however, extending beyond limited historical records are virtually unknown, but would provide crucial data on the tectonic behavior of forearcs. We analyzed the spatiotemporal pattern of Holocene earthquakes on Santa Maria Island (SMI; 37 degrees S), located 20 km off the Chilean coast and approximately 70 km east of the trench. SMI hosts a minimum of 21 uplifted beach berms, of which a subset were dated to calculate a mean uplift rate of 2.3 +/- 0.2 m/ky and a tilting rate of 0.022 +/- 0.002 degrees/ky. The inferred recurrence interval of strandline-forming earthquakes is similar to 180 years. Combining coseismic uplift and aseismic subsidence during an earthquake cycle, the net gain in strandline elevation in this environment is similar to 0.4 m per event
Y1  - 2006
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/11960
UR  - http://www.agu.org/journals/gl/
SN  - 0094-8276
ER  -