Compilation and forecasting of paleoliquefaction evidence for the strength of ground motions in the U.S. Pacific Northwest
Compilation and forecasting of paleoliquefaction evidence for the strength of ground motions in the U.S. Pacific Northwest
复制标题
美国太平洋西北地区地面运动强度的古液化证据的汇编和预测
DOI:
10.1016/j.enggeo.2021.106253
复制
发表时间:
2021
影响因子:
7.4
通讯作者:
Maurer, Brett W.
中科院分区:
文献类型:
--
作者:
Rasanen, Ryan A.;Marafi, Nasser A.;Maurer, Brett W.
In the U.S. Pacific Northwest (PNW), the historic earthquake record is often insufficient to provide inputs to seismic-hazard analyses or to inform ground-motion predictions for certain seismic sources (e.g., the Cascadia Subduction Zone, CSZ). As a result, paleoseismic studies are commonly used to infer information about the seismic hazard. However, among the many forms of coseismic evidence, soil liquefaction provides the best, if not only, evidence from which the intensities of previous ground motions may be constrained. Accordingly, the overarching goal of this research is to use paleoliquefaction to elucidate previous ground motions in the PNW – both for CSZ events and others – and to further constrain the locations, magnitudes, and recurrence rates of such ruptures. Towards that goal, this paper: (i) reviews current paleoliquefaction inverse-analysis methods and their limited, prior applications in the PNW; (ii) compiles all PNW paleoliquefaction evidence from the literature into a GIS database, resulting in data from 185 study sites (e.g., feature locations, types, sizes, and ages); and (iii) develops maps – specific to the CSZ – that forecast paleoliquefaction for 30 different simulations of a CSZ event. These maps can be used to guide field explorations for new evidence, such that they are conducted efficiently and strategically, considering the apparent utility of evidence towards constraint of CSZ ground-motion models. Of additional utility, this process provides regional ground-motion predictions for physics-based simulations of an M9 event, to include expected site effects. Collectively, the maps of expected shaking intensity and liquefaction may be useful in downstream hazard modeling, regional loss estimation, policy development, and science communication. Ultimately, as more paleoliquefaction evidence is identified and studied, better constraint of regional ground-motion hazards will result.
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DOI:
--
发表时间:
2015
期刊:
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