Temporal variation of b value associated with M ∼4 earthquakes in the reservoir-triggered seismic environment of the Koyna–Warna region, Western India

Gupta, Harsh K.; Shashidhar, D.; Rao, N. Purnachandra; Yadav, Amrita; Rohilla, Sunil; Satyanarayana, H. V. S.; Srinagesh, D.

doi:10.1007/s10950-012-9318-3

Cited by 20 publications

(6 citation statements)

References 21 publications

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“…This can result in short-term variations of M c , which, if ignored, can lead to spurious results and misinterpretations (Kagan, 2004;Hainzl, 2013). Thus, a temporal resolution of M c is necessary to get unbiased parameter estimations of seismicity models such as the epidemic-type aftershock sequence (ETAS) model (Ogata, 1988;Zhuang et al, 2012) and to evaluate variations of statistical parameters such as the b-value (e.g., Imoto, 1991;Hainzl and Fischer, 2002;Mallika et al, 2013;Schurr et al, 2014;Huang and Beroza, 2015) or Omori c-value (e.g., Shcherbakov et al, 2004;Narteau et al, 2009;Davidsen et al, 2015). Both are important for physical interpretations and seismic-hazard estimations.…”

Section: Introductionmentioning

confidence: 99%

Rate‐Dependent Incompleteness of Earthquake Catalogs

Hainzl

2016

Seismological Research Letters

129

114

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Important information about the earthquake generation process can be gained from instrumental earthquake catalogs, but this requires complete recordings to avoid biased results. The local completeness magnitude M c is known to depend on general conditions such as the seismographic network and the environmental noise, which generally limit the possibility of detecting small events. The detectability can be additionally reduced by an earthquake-induced increase of the noise level leading to shortterm variations of M c , which cannot be resolved by traditional methods relying on the analysis of the frequency-magnitude distribution. Based on simple assumptions, I propose a new method to estimate such temporal excursions of M c solely based on the estimation of the earthquake rate resulting in a high temporal resolution of M c . The approach is shown to be in agreement with the apparent decrease of the estimated Gutenberg-Richter b-value in high-activity phases of recorded data sets and the observed incompleteness periods after mainshocks. Furthermore, an algorithm to estimate temporal changes of M c is introduced and applied to empirical aftershock and swarm sequences from California and central Europe, indicating that observed b-value fluctuations are often related to rate-dependent incompleteness of the earthquake catalogs.Online Material: MATLAB code to compute rate-dependent completeness magnitude, and figures showing variation in the estimated M c values in equalized time scale.

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Section: Introductionmentioning

confidence: 99%

Rate‐Dependent Incompleteness of Earthquake Catalogs

Hainzl

2016

Seismological Research Letters

129

114

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“…The network is further strengthened by 3 new stand-alone stations and upgrading the short-period seismometers with broadband REFTEK sensors during January 2011, having a total of 13 seismic stations presently. The seismicity during the study period, with a cutoff magnitude M L 1.8 as derived by Mallika et al (2012), is shown along with earthquakes of M C 3.5 for the present study, in Fig. 1 and is also listed in Table 1.…”

Section: Methodsmentioning

confidence: 74%

Source parameters of earthquakes in the reservoir-triggered seismic (RTS) zone of Koyna–Warna, Western India

et al. 2013

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New empirical relations are derived for source parameters of the Koyna-Warna reservoir-triggered seismic zone in Western India using spectral analysis of 38 local earthquakes in the magnitude range M L 3.5-5.2. The data come from a seismic network operated by the CSIR-National Geophysical Research Institute, India, during March 2005 to April 2012 in this region. The source parameters viz. seismic moment, source radius, corner frequency and stress drop for the various events lie in the range of 10 13 -10 16 Nm, 0.1-0.4 km, 2.9-9.4 Hz and 3-26 MPa, respectively. Linear relationships are obtained among the seismic moment (M 0 ), local magnitude (M L ), moment magnitude (M w ), corner frequency (fc) and stress drop (Dr). The stress drops in the Koyna-Warna region are found to increase with magnitude as well as focal depths of earthquakes. Interestingly, accurate depths derived from moment tensor inversion of earthquake waveforms show a strong correlation with the stress drops, seemingly characteristic of the Koyna-Warna region.

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“…The b -value indirectly measures the stress of a seismic area [ 36 ]. Generally, the b -value of reservoir-triggered seismicity is larger than that associated with tectonic earthquakes [ 37 ]. The estimation of the b -value can be performed by using several techniques; in this study, we employ the maximum likelihood method [ 38 ]:

where < M > is the mean magnitude of earthquake dataset with magnitude larger or equal to that of completeness M c , while Δ M bin is the width of the binning of the catalogue [ 39 ], which is typically 0.1.…”

Section: The Gutenberg–richter Lawmentioning

confidence: 99%

Visibility Graph Analysis of Reservoir-Triggered Seismicity: The Case of Song Tranh 2 Hydropower, Vietnam

Telesca

Thai

Lovallo

et al. 2022

Entropy

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In this study, the visibility graph analysis of seismicity triggered by Song Tranh 2 hydropower (Vietnam) is performed. The relationship between the seismic (the Gutenberg–Richter b-value) and topological (the k–M slope) parameters of seismicity is analysed. Our findings indicate that the relationship between the Gutenberg–Richter b-value and the k–M slope of the investigated seismicity is in agreement with that characterising the tectonic seismicity. The results obtained from analysing the reservoir-triggered seismicity of Song Tranh 2 area could contribute to better characterisation of the relationship between the seismological and topological parameters of seismicity, strengthening the universal character of the relationship between the b-value and the k–M slope.

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Temporal variation of b value associated with M ∼4 earthquakes in the reservoir-triggered seismic environment of the Koyna–Warna region, Western India

Cited by 20 publications

References 21 publications

Rate‐Dependent Incompleteness of Earthquake Catalogs

Rate‐Dependent Incompleteness of Earthquake Catalogs

Source parameters of earthquakes in the reservoir-triggered seismic (RTS) zone of Koyna–Warna, Western India

Visibility Graph Analysis of Reservoir-Triggered Seismicity: The Case of Song Tranh 2 Hydropower, Vietnam

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