Detailed Waveform Inversion for Moment Tensors of M 4 Events: Examples from the Corinth Gulf, Greece

Zahradnı́k, Jiřı́; Janský, Jaromír; Plicka, Vladimír

doi:10.1785/0120080124

Cited by 56 publications

(21 citation statements)

References 44 publications

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“…Though the waveform inversion technique is popular for determining source mechanism using multi-station broadband data (Zahradnik et al 2008), this technique can also be used for single station data (Dregger and Helmberger, 1993). For larger local or regional earthquakes M>4.0, it is possible to combine multistation data from the national broadband network for analysis, but the smaller local earthquakes (M< 3.0) recorded by a single observatory normally remain unstudied.…”

Section: Discussionmentioning

confidence: 99%

Source parameters and focal mechanisms of local earthquakes: Single broadband observatory at ISM Dhanbad

et al. 2009

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A three-component broadband seismograph is in operation since January 2007 at the Indian School of Mines (ISM) campus. We have used the broadband seismograms of two local earthquakes M <3 recorded by this single station to illustrate its efficacy in understanding the source processes and tectonics in Dhanbad area. Source parameters and fault plane solutions are obtained through waveform inversion. It is observed that these two earthquakes occurred in the lower crust at a depth of 26 km by strike slip faulting. North-south compressional and east-west tensional stresses are dominant in the area, and the lower crust is the source area for the local earthquakes.

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Section: Discussionmentioning

confidence: 99%

Source parameters and focal mechanisms of local earthquakes: Single broadband observatory at ISM Dhanbad

et al. 2009

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“…Waveform inversion techniques were also applied in the study area in order to compute fault plane solutions for moderate to strong events in several cases (e.g. Baker et al 1997;Evangelidis et al 2008;Zahradnik et al 2008;Sokos et al 2012).…”

Section: O M E N T T E N S O R Smentioning

confidence: 99%

Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece)

Mesimeri¹,

Karakostas²,

Papadimitriou³

et al. 2017

Geophysical Journal International

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“…It is usually applied employing the point‐source approximation and assuming a time‐independent focal mechanism. The inversion is performed in the time domain (Dreger & Woods 2002; Zahradník et al 2005, 2008a,b; Sokos & Zahradník 2008; Adamová et al 2009; Hingee et al 2011) or in the frequency domain using amplitude spectra (Cesca et al 2006) or complex spectra (Cesca & Dahm 2008; Vavryčuk 2011a,b). The inversion yields the moment tensor and, as a by‐product, the common source‐time function.…”

Section: Introductionmentioning

confidence: 99%

Moment tensor inversion of waveforms: a two-step time-frequency approach

Vavryčuk¹,

Kühn

2012

Geophysical Journal International

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SUMMARY We present a moment tensor inversion of waveforms, which is more robust and yields more stable and more accurate results than standard approaches. The inversion is performed in two steps and combines inversions in time and frequency domains. First, the inversion for the source‐time function is performed in the frequency domain using complex spectra. Second, the time‐domain inversion for the moment tensor is performed using the source‐time function calculated in the first step. In this way, we can consider a realistic, complex source‐time function and still keep the final moment tensor inversion linear. Using numerical modelling, we compare the efficiency and accuracy of the proposed approach with standard waveform inversions. We study the sensitivity of the retrieved double‐couple and non‐double‐couple components of the moment tensors to noise in the data, to inaccuracies of the location and of the velocity model, and to the type of the focal mechanism. Finally, the proposed moment tensor inversion is tested on real data observed in a complex 3‐D inhomogeneous geological environment: a production blast and a rockburst in the Pyhäsalmi ore mine, Finland.

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Detailed Waveform Inversion for Moment Tensors of M 4 Events: Examples from the Corinth Gulf, Greece

Cited by 56 publications

References 44 publications

Source parameters and focal mechanisms of local earthquakes: Single broadband observatory at ISM Dhanbad

Source parameters and focal mechanisms of local earthquakes: Single broadband observatory at ISM Dhanbad

Relocation of recent seismicity and seismotectonic properties in the Gulf of Corinth (Greece)

Moment tensor inversion of waveforms: a two-step time-frequency approach

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