Using uplifted Holocene beach berms for paleoseismic analysis on the Santa María Island, south-central Chile

Details Using uplifted Holocene beach berms for paleoseismic analysis on the Santa María Island, south-central Chile Using uplifted Holocene beach berms for paleoseismic analysis on the Santa María Island, south-central Chile

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315302b&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15302

Physics

Geophysics

10

Marine Geology And Geophysics: Subduction Zone Processes (1031, 3613, 8170, 8413), Seismology: Paleoseismology (8036), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Subduction Zones (1207, 1219, 1240), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)

Scientific paper

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 María Island (SMI; 37°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 °/ky. The inferred recurrence interval of strandline-forming earthquakes is ~180 years. Combining coseismic uplift and aseismic subsidence during an earthquake cycle, the net gain in strandline elevation in this environment is ~0.4 m per event.

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