Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2768

Authors: Di Alessandro, C.*
Boatwright, J.*
Title: A Stochastic Estimate of Ground Motion at Oceano, California, for the M 6.5 22 December 2003 San Simeon Earthquake, Derived from Aftershock Recordings
Title of journal: Bulletin of the Seismological Society of America
Series/Report no.: Vol. 96, No. 4A, 2006
Publisher: Seismological Society of America
Issue Date: Aug-2006
DOI: 10.1785/0120040183
Keywords: Stochastic,
simulation,
ground motion,
spectral ratio
Green’s function
earthquake
Abstract: The U.S. Geological Survey deployed a digital seismic station in Oceano, California, in February 2004, to investigate the cause of damage and liquefaction from the 22 December 2003 Mw 6.5 San Simeon earthquake. This station recorded 11 Mw 2.8 aftershocks in almost 8 weeks. We analyze these recordings, together with recordings of the mainshock and the same aftershocks obtained from nearby stations in Park Hill and San Luis Obispo, to estimate the mainshock ground motion in Oceano. We estimate the Fourier amplitude spectrum using generalized spectral ratio analysis. We test a set of aftershocks as Green’s functions by comparing simulated and recorded acceleration amplitude spectra for the mainshock at San Luis Obispo and Park Hill. We convolve the aftershock accelerograms with a stochastic operator to simulate the duration and phase of the mainshock accelerograms. This approximation allows us to extend the range of aftershocks that can be used as Green’s functions to events nearly three magnitude units smaller than the mainshock. Our realizations for the mainshock accelerogram at Oceano yield peak ground accelerations distributed as 28% +/- 4%g. We interpret these realizations as upper bounds for the actual ground motion, because our analysis assumes a linear response, whereas the presence of liquefaction indicates that the ground behaved nonlinearly in Oceano.
Appears in Collections:04.06.04. Ground motion
Papers Published / Papers in press

Files in This Item:

File Description SizeFormatVisibility
Oceano_Paper.pdfPublished paper288.51 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Share this record
Del.icio.us

Citeulike

Connotea

Facebook

Stumble it!

reddit


 

Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA