Earthquakes generated from bedding plane-parallel reverse faults above an active wedge thrust, Seattle fault zone

TitleEarthquakes generated from bedding plane-parallel reverse faults above an active wedge thrust, Seattle fault zone
Publication TypeJournal Article
Year of Publication2008
AuthorsKelsey, HM, Sherrod, BL, Nelson, AR, Brocher, TM
JournalGeological Society of America Bulletin
Volume120
Issue11-12
Pagination1581-1597
ISSN0016-7606
Abstract

A key question in earthquake hazard analysis is whether individual faults within fault zones represent independent seismic sources. For the Seattle fault zone, an upper plate structure within the Cascadia convergent margin, evaluating seismic hazard requires understanding how north-side-up, bedding-plane reverse faults, which generate late Holocene fault scarps, interact with the north-vergent master-ramp thrust and overlying backthrust of the fault zone. A regional uplift at A.D. 900-930 involved an earthquake that nucleated at depth and included slip on both the master-ramp thrust and the backthrust. This earthquake also included slip on some of the

DOI10.1130/B26282.1