S/P Amplitude Ratios Derived from Single-Component Seismograms and Their Potential Use in Constraining Focal Mechanisms for Microearthquake Sequences Article Swipe
D. R. Shelly
,
Robert J. Skoumal
,
Jeanne L. Hardebeck
·
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1785/0320220002
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1785/0320220002
Focal mechanisms, which reflect the sense of slip in earthquakes, provide important constraints for understanding crustal tectonics and earthquake source physics, including the interactions among earthquakes during mainshock–aftershock sequences or seismic swarms. Focal mechanisms of small (magnitude ≲3.5) earthquakes are usually determined by first-motion P-wave polarities, sometimes supplemented by the ratio of S-wave to P-wave amplitudes (S/P). However, focal mechanisms of such events can be difficult to reliably constrain, particularly with sparse recording networks or very small magnitude events. Here, we describe a method for deriving S/P amplitude ratios from P/P and S/S amplitude ratios measured on single seismic components between pairs of nearby events, as is often performed during correlation-based earthquake detection and relocation. These measurements can be transformed into relative S/P amplitude ratios, or they can be combined with a smaller number of traditional S/P amplitude ratios to provide a single-channel estimation of full S/P ratios, even for low signal-to-noise-ratio events not routinely cataloged and not amenable to traditional S/P ratio processing. This approach has the potential to greatly expand the applicability of S/P amplitude ratios, providing additional constraints for focal mechanisms of small earthquakes, particularly for spatially concentrated seismicity sequences.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1785/0320220002
- https://pubs.geoscienceworld.org/ssa/tsr/article-pdf/2/2/118/5613830/tsr-2022002.1.pdf
- OA Status
- diamond
- Cited By
- 12
- References
- 25
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4293108251
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Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4293108251Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1785/0320220002Digital Object Identifier
- Title
-
S/P Amplitude Ratios Derived from Single-Component Seismograms and Their Potential Use in Constraining Focal Mechanisms for Microearthquake SequencesWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2022Year of publication
- Publication date
-
2022-04-01Full publication date if available
- Authors
-
D. R. Shelly, Robert J. Skoumal, Jeanne L. HardebeckList of authors in order
- Landing page
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https://doi.org/10.1785/0320220002Publisher landing page
- PDF URL
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https://pubs.geoscienceworld.org/ssa/tsr/article-pdf/2/2/118/5613830/tsr-2022002.1.pdfDirect link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
-
diamondOpen access status per OpenAlex
- OA URL
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https://pubs.geoscienceworld.org/ssa/tsr/article-pdf/2/2/118/5613830/tsr-2022002.1.pdfDirect OA link when available
- Concepts
-
Amplitude, Seismogram, Seismology, Microearthquake, Geology, Focal mechanism, Magnitude (astronomy), Induced seismicity, Seismic wave, P wave, Geodesy, Tectonics, Physics, Optics, Astrophysics, Medicine, Atrial fibrillation, CardiologyTop concepts (fields/topics) attached by OpenAlex
- Cited by
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12Total citation count in OpenAlex
- Citations by year (recent)
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2025: 2, 2024: 4, 2023: 3, 2022: 3Per-year citation counts (last 5 years)
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25Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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