Relative Moment Tensor Inversion for Microseismicity: Application to Clustered Earthquakes in the Cascadia Forearc Article Swipe
Doriane Drolet
,
M. G. Bostock
,
Simon M. Peacock
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.26443/seismica.v2i4.1311
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.26443/seismica.v2i4.1311
The relative abundance of small earthquakes affords significant opportunities for improved understanding of regional seismotectonics; however, determining moment tensors for such events recorded on regional networks is complicated by low signal-to-noise ratios, sparse station sampling and complex wave propagation at short periods. We build upon previous work in designing a multiple-event, simultaneous moment tensor inversion scheme for small earthquakes that employs constraints from P-wave polarities, relative amplitudes of P- and S-waves recorded at common stations, and local magnitude estimates. Our method does not require a priori knowledge of a reference moment tensor. High-fidelity polarity and relative amplitude data are recovered using principal component decomposition of clustered-event waveforms. These data are employed within a multi-stage iterative framework to invert for moment tensors and incorporate local magnitude information. Synthetic examples employing as few as four high-quality and spatially-distributed stations yield accurate moment tensor estimates. We demonstrate our approach on a cluster of seismicity near San Juan Island, Washington, USA, within the Cascadia forearc. Our results are consistent with previous characterization of the local stress regime, and support an interpretation of swarm behaviour resulting from migration of fluids originating from dehydration of the subducting Juan de Fuca plate.
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- Type
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- Language
- en
- Landing Page
- https://doi.org/10.26443/seismica.v2i4.1311
- OA Status
- diamond
- Related Works
- 10
- OpenAlex ID
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https://openalex.org/W4402564385Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.26443/seismica.v2i4.1311Digital Object Identifier
- Title
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Relative Moment Tensor Inversion for Microseismicity: Application to Clustered Earthquakes in the Cascadia ForearcWork title
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articleOpenAlex work type
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enPrimary language
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2024Year of publication
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2024-09-17Full publication date if available
- Authors
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Doriane Drolet, M. G. Bostock, Simon M. PeacockList of authors in order
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https://doi.org/10.26443/seismica.v2i4.1311Publisher landing page
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YesWhether a free full text is available
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diamondOpen access status per OpenAlex
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https://doi.org/10.26443/seismica.v2i4.1311Direct OA link when available
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Forearc, Geology, Seismology, Moment tensor, Inversion (geology), Subduction, Tectonics, Oceanography, Deformation (meteorology)Top concepts (fields/topics) attached by OpenAlex
- Cited by
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0Total citation count in OpenAlex
- Related works (count)
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10Other works algorithmically related by OpenAlex
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