Earthquake rupture and ground-motion

详细信息    Earthquake rupture and ground-motion

• 出版日期：2007.
• 页数：1 online resource.
• 第一责任说明：Susana Ines da Silva Custodio.
• 分类号：a263.942
• ISBN：9780549363323(e-book) :

MARC全文

62h0046001 20131115163155.0 cr an |||||||| 131023s2007 a fsbm |000|0 eng | 3291312 9780549363323(e-book) : CNY371.35 NGL eng NGL a263.942 Custodio, Susana Ines da Silva. Earthquake rupture and ground-motion [electronic resource] : the 2004 Mw 6.0 Parkfield earthquake / Susana Ines da Silva Custodio. 2007. 1 online resource. Description based on online resource; title from title page (viewed Oct. 23, 2013) Thesis (Ph.D.)--University of California, Santa Barbara, 2007. Includes bibliographical references. We present a study of the faulting process of the 2004 MW6 Parkfield earthquake and its resulting ground-motion. We use both seismic data alone and a combination of seismic and geodetic data to infer the temporal evolution of slip on the fault plane during the 2004 Parkfield earthquake. The seismic dataset comprises strong-motion accelerograms recorded at 43 sites and the geodetic dataset is composed of 1-Hz GPS displacement records observed at 13 stations. We use the geodetic data to infer the static distribution of slip on the fault. The seismic data serves to retrieve the full space and time evolution of slip. The seismic data is corrected in order to account for site effects. The pattern of ground-motion observed during the 2004 Parkfield earthquake can be partly explained by site effects. Three-dimensional material heterogeneity in the Parkfield region also contribute to the strong shaking observed northwest of the hypocenter (over twice the acceleration of gravity). We employ a non-linear least-squares algorithm to infer the static slip distribution from the geodetic data. We then use the geodetic data to constrain the slip amplitude in a non-linear inversion of the seismic data that yields the complete temporal evolution of slip. The 2004 Parkfield earthquake, as imaged in our model, started with a very strong and localized burst of energy from the hypocenter； here the rupture velocity was very fast. We locate a second region of significant slip northwest of the hypocenter where slip was slower and spread over a region wider than the initial asperity at the hypocenter. Trade-offs between various model parameters result in uncertainties in the faulting models, which we assess using various techniques. We also study the rupture mechanism of the 1966 MW6 Parkfield earthquake. We conclude that the two most recent Parkfield earthquakes do not share identical slip distributions. These two earthquakes actually appear to be more complementary than characteristic. Thus, an extreme interpretation of the characteristic earthquake hypothesis can be rejected for Parkfield based on seismic data. Earthquakes California ; Parkfield Region. Electronic dissertations local. aInternet resource. aCN b010001 http://pqdt.bjzhongke.com.cn/Detail.aspx?pid=qkaKX7XMyt4%3d 010001 Bs2731 rCNY371.35 ; h1 bs1310