Segmented seismicity of the M w 6.2 Baladeh earthquake sequence (Alborz Mountains, Iran) revealed from regional moment tensors

Donner, Stefanie; Rössler, Dirk; Ghods, Abdolreza; Strecker, Manfred R.

doi:10.1007/s10950-013-9362-7

Cited by 18 publications

(16 citation statements)

References 43 publications

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“…Earthquake 05 June 2004 20:58 UTC This earthquake is one of the smaller aftershocks of the Baladeh sequence in 2004, which we analyzed in an earlier publication from broadband data alone (Donner et al, 2013). It occurred at 20:58:13 UTC at 36.414°latitude and 51.430°l ongitude with a Nuttli magnitude M N of 3.2 (Nuttli, 1973, IRSC).…”

Section: Resultsmentioning

confidence: 99%

“…For these frequencies, the appropriateness of the velocity model used starts to become critical, because of the relationship between frequency and wavelength. In a former study, we derived a 1D velocity model for moment tensor inversions within the Alborz mountains (Table 1; Donner et al, 2013). This model proved to be quite satisfactory for mid-and long-period waveforms (10-60 s ≈ 0:016-0:1 Hz), while remaining reliable for frequencies up to about 0.3-0.5 Hz for body waves.…”

Section: Data Processingmentioning

confidence: 97%

“…Within the Alborz mountains, only six stations are installed, three of which are in the central Alborz. Together with the large azimuthal gap due to the South Caspian Basin (SCB), successful inversion for moment tensors with standard methods often show instabilities and are in some cases not reliable enough for seismotectonic interpretations (Donner et al, 2013).…”

Section: Data and Working Proceduresmentioning

confidence: 99%

“…In a previous study (Donner et al, 2013), we estimated the error in depths by considering all depths within a range of the lowest selection criteria plus 20%. This was an ad hoc assumption based on practical considerations.…”

Section: Data Processingmentioning

confidence: 99%

“…Detailed seismic source studies, however, are rare due to the above mentioned problems. Two of the selected events in this study have been analyzed previously using only broadband data (Donner et al, 2013). They are aftershocks of the M w 6.2 Baladeh event of May 2004.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Combined Inversion of Broadband and Short-Period Waveform Data for Regional Moment Tensors: A Case Study in the Alborz Mountains, Iran

Donner

Rössler

Ghods

2014

Bulletin of the Seismological Society of America

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In this study, we suggest a novel approach for the retrieval of regional moment tensors for earthquakes with small to moderate magnitudes. The first modification is the combined inversion of broadband and short-period waveform data. The broadband waveforms are inverted in a frequency range suitable for surface waves, whereas for the short-period data a frequency range suitable for body waves is applied. The second modification is the use of first-motion body-wave polarities to select the most probable solution out of all solutions from inversion. To combine three different criteria for selecting the most probable solution (i.e., residual from inversion, doublecouple content of solution, number of nonmatching first-motion body-wave polarities), the L2 norm is applied to the normalized parameters. We chose five earthquakes within the Alborz mountains, Iran, as a case study (3:1 ≤ M w ≤ 4:1). In this area, several factors exacerbate the difficulty of performing inversion for moment tensors, for example, a heterogeneous station network and large azimuthal gaps. We have demonstrated that our approach supplies reliable moment tensors when inversion from broadband data alone fails. In one case, we successfully retrieved a stable solution from short-period waveform data alone. Thus, our approach enables successful determination of seismic moment tensors wherever a sparse network of broadband stations has thus far prevented it.

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Section: Resultsmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 97%

Section: Data and Working Proceduresmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Combined Inversion of Broadband and Short-Period Waveform Data for Regional Moment Tensors: A Case Study in the Alborz Mountains, Iran

Donner

Rössler

Ghods

2014

Bulletin of the Seismological Society of America

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Retrieval of the Seismic Moment Tensor from Joint Measurements of Translational and Rotational Ground Motions: Sparse Networks and Single Stations

Donner

Igel

Hadziioannou

2018

Moment Tensor Solutions

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On the strength of the phase cross-correlation in retrieving the Green’s function information in a region affected by persistent aftershock sequences

2021

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Although research on seismic interferometry is now entering a phase of maturity, earthquakes are still the most troublesome issues that plague the process in real applications. To address the problems that arise from spatially scattered and temporally transient enormous earthquakes, preference is usually given to the use of time-dependent weights. However, small earthquakes can also have a disturbing effect on the accuracy of interpretations if they are persistently clustered right next to the perpendicular bisector of the line joining station pairs or in close proximity to one of the stations. With regard to the suppression of these cluster earthquakes, commonly used solutions for dealing with monochromatic microseismic cluster events (e.g., implementing a band-reject filter around a comparatively narrow frequency band or whitening the amplitude spectra before calculating the cross-spectrum between two signals) may not have the necessary efficiency since earthquake clusters are generally a collection of events with different magnitudes, each having its own frequency and energy contents. Therefore, the only solution left in such a situation is to use stronger non-linear time-dependent weights (e.g., square of the running average or one-bit normalization), which may cause Green’s function amplitude information to be lost. In this paper, by simulating the records of a benchmark earthquake MN 5.2 with the help of empirical Green’s functions (EGF) obtained after the Ahar-Varzeghan Earthquake Doublet (MN 6.4 and MN 6.3), it is shown that the amplitude-unbiased phase cross-correlation is a relatively efficient approach in the face of the issues concerning long-standing cluster events.

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Segmented seismicity of the M w 6.2 Baladeh earthquake sequence (Alborz Mountains, Iran) revealed from regional moment tensors

Cited by 18 publications

References 43 publications

Combined Inversion of Broadband and Short-Period Waveform Data for Regional Moment Tensors: A Case Study in the Alborz Mountains, Iran

Combined Inversion of Broadband and Short-Period Waveform Data for Regional Moment Tensors: A Case Study in the Alborz Mountains, Iran

Retrieval of the Seismic Moment Tensor from Joint Measurements of Translational and Rotational Ground Motions: Sparse Networks and Single Stations

On the strength of the phase cross-correlation in retrieving the Green’s function information in a region affected by persistent aftershock sequences

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