Toward Source Region Tomography With Intersource Interferometry: Shear Wave Velocity From 2018 West Bohemia Swarm Earthquakes

Eulenfeld, Tom

doi:10.1029/2020jb019931

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…EULENFELD ET AL. The associated high signal quality is anticipated to support lapse time earthquake tomography (Calò & Dorbath, 2013) to image the evolving reservoir properties, and coda waveform based inter-source interferometry (Eulenfeld, 2020b;Snieder & Vrijlandt, 2005) to help constrain the relative contributions of local medium changes and earthquake source effects on the obtained scaling relations. Noise based monitoring and imaging can also provide independent observations for improved trade-off mitigation (Hillers et al, 2015;Obermann et al, 2015).…”

Section: Appendix A: Trade-off Between High-frequency Falloff Corner ...mentioning

confidence: 99%

Induced Earthquake Source Parameters, Attenuation, and Site Effects From Waveform Envelopes in the Fennoscandian Shield

et al. 2023

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We analyze envelopes of 233 and 22 ML0.0 to ML1.8 earthquakes induced by two geothermal stimulations in the Helsinki, Finland, metropolitan area. We separate source spectra and site terms and determine intrinsic attenuation and the scattering strength of shear waves in the 3–200 Hz frequency range using radiative transfer based synthetic envelopes. Displacement spectra yield scaling relations with a general deviation from self‐similarity, with a stronger albeit more controversial signal from the weaker 2020 stimulation. The 2020 earthquakes also tend to have a smaller local magnitude compared to 2018 earthquakes with the same moment magnitude. We discuss these connections in the context of fluid effects on rupture speed or medium properties. Site terms demonstrate that the spectral amplification relative to two reference borehole sites is not neutral at the other sensors; largest variations are observed at surface stations at frequencies larger than 30 Hz. Intrinsic attenuation is exceptionally low with Qi−1 ${Q}_{\mathrm{i}}^{-1}$ values down to 2.4 × 10−5 at 20 Hz, which allows the observation of a diffuse reflection at the ∼50 km deep Moho. Scattering strength is in the range of globally observed data with Qnormalsnormalc−1 ${Q}_{\mathrm{s}\mathrm{c}}^{-1}$ between 10−3 and 10−4. The application of the employed Qopen analysis program to the 2020 data in a retrospective monitoring mode demonstrates its versatility as a seismicity processing tool. The diverse results have implications for scaling relations, hazard assessment and ground motion modeling, and imaging and monitoring using ballistic and scattered wavefields in the crystalline Fennoscandian Shield environment.

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Section: Appendix A: Trade-off Between High-frequency Falloff Corner ...mentioning

confidence: 99%

Induced Earthquake Source Parameters, Attenuation, and Site Effects From Waveform Envelopes in the Fennoscandian Shield

et al. 2023

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“…This is as if we convert one of the earthquakes into a virtual “seismometer” and record the other event. The inter‐source interferometry method has succeeded in retrieving the seismic response between earthquakes in both global (Curtis et al., 2009) and regional scales (Eulenfeld, 2020; Tonegawa & Nishida, 2010), providing unprecedented resolution in revealing the source‐side velocity structure. In particular, for the subducting slab scenario, this novel approach can isolate the deep slab from shallow lithospheric structures by cross‐correlating coda waves from deep earthquakes at common stations.…”

Section: Deep Slab Model For Inter‐source Interferometrymentioning

confidence: 99%

Small‐Scale Intraslab Heterogeneity Weakens Into the Mantle Transition Zone

Shen

Zhan

Jackson

2021

Geophysical Research Letters

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Multiscale seismic structures of subducting slabs provide fundamental constraints on the slab thermal and petrological properties. Extensive investigations have been conducted on the large-(>100 km) and intermediate-scale (10-100 km) slab structures. For example, subducting plates imaged from tomographic models are characterized as large-scale high-velocity anomalies descending into the mantle with complicated destinies (e.g.

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“…This allows for forming deep virtual seismometers to detect seismic signals sensitive to deep‐earth structures with minimal signal disturbance due to shallow‐depth structure heterogeneities (Shen & Zhan, 2020; Shen et al., 2021). Also, the inter‐source correlations are used for imaging crustal structures (Shirzad et al., 2019), shear‐wave velocities in areas around different source clusters (Eulenfeld, 2020), and monitoring of micro‐earthquakes (Morency & Matzel, 2017).…”

Section: Introductionmentioning

confidence: 99%

On the Formation of Global Inter‐Source Correlations and Applications to Constrain the Interiors of the Earth and Other Terrestrial Planets

Wang

Tkalčić

2023

JGR Solid Earth

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The cross‐correlation stack of earthquake late‐coda between seismic receivers on a global scale – global inter‐receiver correlogram – exhibits numerous features that provide information on the Earth's structure. The cross‐correlation stack between seismic sources (global inter‐source correlogram) can also be constructed, and, in theory, it should reproduce the correlation features seen in the inter‐receiver correlogram. However, practical attempts at global inter‐source correlograms have not produced the theoretical expectations. Namely, the obtained inter‐source correlograms are void of discernable correlation features. Here, we address this problem and document the steps that have to be undertaken to produce the inter‐source global correlogram with the equivalent abundance of correlation features. We show that forming inter‐source correlation features requires constructive contributions determined by specific source mechanisms and source‐receiver geometries. They are overwhelmed by destructive contributions if seismic records of all available sources and source‐receiver geometries are used. Building upon that, we present an effective procedure for constructing global inter‐source correlations through a rigorous selection of source mechanisms and source‐receiver geometries. The resulting inter‐source correlations exhibit numerous prominent correlation features as predicted. Notably, this method enables the construction of global inter‐source correlations in a special case with a single seismic receiver. Furthermore, we explore and demonstrate the feasibility of utilizing single‐receiver inter‐source correlations to constrain the interiors of the Earth and other terrestrial bodies. Our study facilitates practical applications of global inter‐source correlations, providing additional constraints on the Earth's structure and offering an effective routine to probe the interiors of other planets and moons using currently affordable resources.

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Toward Source Region Tomography With Intersource Interferometry: Shear Wave Velocity From 2018 West Bohemia Swarm Earthquakes

Cited by 8 publications

References 42 publications

Induced Earthquake Source Parameters, Attenuation, and Site Effects From Waveform Envelopes in the Fennoscandian Shield

Induced Earthquake Source Parameters, Attenuation, and Site Effects From Waveform Envelopes in the Fennoscandian Shield

Small‐Scale Intraslab Heterogeneity Weakens Into the Mantle Transition Zone

On the Formation of Global Inter‐Source Correlations and Applications to Constrain the Interiors of the Earth and Other Terrestrial Planets

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