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Seismic wave amplification and localized ground effects
Published in Rajib Biswas, Recent Developments in Using Seismic Waves as a Probe for Subsurface Investigations, 2023
For documented earthquakes from specific tectonic environments such as intraplate regions, a detailed characterization of seismic-induced ground effects can be used as a fundamental tool to define the seismic landscape expected for a given area and level of seismicity in the future. This also can be used as a useful back analysis tool for assessing the actual vulnerability of the environment and for predicting its future response to seismic wave amplification in that area (Serva, 1994; Profido et al., 2002; Liu-Zheng et al., 2017; Naik et al., 2020; Shimony et al., 2020), which is much needed for a proper definition of land use codes and land planning in low seismic areas. Also, this approach may guide locating the suitable sites for installing seismic stations, understanding the subsurface geology, which may be helpful to understand the site amplification studies for future seismic hazard assessment.
Random Vibration: Probabilistic Forces
Published in Haym Benaroya, Mark Nagurka, Seon Han, Mechanical Vibration, 2017
Haym Benaroya, Mark Nagurka, Seon Han
Intraplate earthquakes occur within plate interiors where they are not perfectly rigid. In some cases, for example in Hawaii, these earthquakes are associated with intraplate volcanism. These are studied, generally, to provide data about where and how the plate tectonic model does not fully describe tectonic processes.
On strong motion monitoring and recordings in Iceland
Published in A.S. Elnashai, European Seismic Design Practice, 1995
Gunnar I. Baldvinsson, Ódinn Thórarinsson, Símon Ólafsson, Ragnar Sigbjörnsson
when passing Iceland. All major destructive earthquakes have had epicentres within these areas. Earthquakes that have occurred outside these areas are commonly characterised as intraplate earthquakes (Einarsson, 1991). They are apparently smaller and not as frequent as earthquakes within the seismic areas mentioned.
A geophysical investigation of the 2018 Lake Muir earthquake sequence: reactivated Precambrian structures controlling modern seismicity
Published in Australian Journal of Earth Sciences, 2021
S. Standen, M. Dentith, D. Clark
On the 16th of September 2018 an ML5.7 earthquake occurred near Lake Muir, in the southwest of Western Australia (Figure 1). This event was followed by numerous aftershocks, including one ML5.4 event. Lake Muir is far from any modern plate boundary and as such the seismicity is unequivocally intraplate. A limited number of previous studies suggest that seismicity in the southwest of Western Australia is controlled by the presence and geometry of pre-existing structures in basement geology that date from the Precambrian (Dentith et al., 2009; Estrada-Roldan, 2008; King et al., 2019). This is consistent with widely supported ideas, as outlined by Talwani (2017), that intraplate seismicity is commonly the result of a ‘zone of weakness’ in the crust, which is reactivated in the contemporary stress field, commonly in association with a local amplification of the stress field. Unfortunately, the structural makeup of southwest Western Australia is very complex, and for this reason progress towards understanding why certain areas focus seismicity has been limited. Here we have used aeromagnetic and seismological datasets to investigate the relationship between the Lake Muir seismicity and underlying geology in the area. By studying the local geology, it may be possible to deduce whether some aspect of the local geology promotes an elevated seismogenic potential compared with elsewhere, allowing a better understanding of what processes influence the location of large earthquakes in the southwest of Western Australia.