Horizontal deformation in the Cascadia subduction zone as derived from serendipitous geodetic data

Snay, RA; Matsikari, T

dc.contributor.author	Snay, RA	en
dc.contributor.author	Matsikari, T	en
dc.date.accessioned	2014-03-01T01:08:23Z
dc.date.available	2014-03-01T01:08:23Z
dc.date.issued	1991	en
dc.identifier.issn	0040-1951	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10453
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0026014401&partnerID=40&md5=29a4083bd8524d51510706d2ee8ba9fe	en
dc.subject.classification	Geochemistry & Geophysics	en
dc.subject.other	deformation	en
dc.subject.other	earthquake	en
dc.subject.other	geodetic data	en
dc.subject.other	Global Positioning System	en
dc.subject.other	recurrence interval	en
dc.subject.other	shear strain	en
dc.subject.other	subduction	en
dc.subject.other	Pacific, Cascadia Subduction Zone	en
dc.title	Horizontal deformation in the Cascadia subduction zone as derived from serendipitous geodetic data	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	Data from recent Global Positioning System (GPS) surveys are combined with triangulation/trilateration data to estimate horizontal shear-strain rates for two regions in the Cascadia subduction zone. Near Bellingham, Washington, we estimate that the maximum horizontal shear rate (gamma) equals 0.116 +/- 0.089-mu-rad/yr and the direction of maximum horizontal contraction (theta) orients N71-degrees-E +/- 21-degrees for data spanning the 1905-1985 interval. The corresponding estimates for a region near Portland, Oregon, are 0.057 +/- 0.027-mu-rad/yr and N95-degrees-E +/- 14-degrees for data spanning the 1881-1988 interval. These estimates are consistent with estimates from independent geodetic data in the area. Moreover, the estimates for theta are consistent with the N68-degrees-E direction of ongoing convergence between the Juan de Fuca plate and the North American plate as predicted by the NUVEL-1 plate motion model. This consistency between theta-estimates and the direction of plate convergence supports the argument for the possibility of a great subduction earthquake occurring in the Cascadia subduction zone. The low shear rates, however, imply that the recurrence interval between such earthquakes would be several centuries long.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Tectonophysics	en
dc.identifier.isi	ISI:A1991FY74600005	en
dc.identifier.volume	194	en
dc.identifier.issue	1-2	en
dc.identifier.spage	59	en
dc.identifier.epage	67	en