Temporal and spatial variations of Gutenberg-Richter parameter and fractal dimension in Western Anatolia, Turkey

Bayrak, Erdem; Yılmaz, Şeyda; Bayrak, Yusuf

doi:10.1016/j.jseaes.2017.01.031

Cited by 18 publications

(6 citation statements)

References 80 publications

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“…Spatial variations in the -value can probably be associated with the nonuniform distribution of stresses or the rates of their growth across differently sized inhomogeneities of the lithosphere. This hypothesis agrees with the significant deviations of from zero in the time variations during transitional regimes of the seismic process when the stress field and, perhaps, also the strength of the medium locally substantially vary (Smirnov and Ponomarev, 2004;Bayrak et al, 2017;Smirnov et al, 2018). .…”

Section: Discussionsupporting

confidence: 78%

Estimates of Lithospheric Failure Cycle Parameters from Regional Earthquake Catalogues

Смирнов

Ommi

Potanina

et al. 2019

Izv., Phys. Solid Earth

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Based on the generalized frequency-magnitude relation for earthquakes, the failure cycle parameters are estimated from regional seismic catalogues for zones with different typical tectonic regimes: subduction zones and shear fault zones. The Kamchatka and Japan catalogues are used for the subduction zones. The estimates for the shear fault zones are based on the data for the San-Andreas Fault presented in the Northern California Earthquake Catalog, the data for the North Anatolian fault presented in the earthquake catalogue for Greece, and the data for the Zagros shear zone presented in the catalogue for Iran. Distribution maps are constructed for the failure cycle duration and for parameter characterizing the dependence of the duration of the failure cycle on the size of the fractured area. It is shown that on average for each region, the values are close to zero, indicating that the probability of failure for structural elements of the medium does not depend on their size and that the strength and stress distributions by size of inhomogeneities are, on average, consistent with each other. The intraregional spatial variations of parameter exceed the statistical error of the estimates, which can be interpreted as evidence for the existence of variations in the distribution of stresses by size of inhomogeneities. The intensities of these variations estimated under Zhurkov's kinetic concept of fracture of solids are comparable to the stresses released by earthquakes. The statistical range of regional variations in the duration of the failure cycle is about two orders of magnitude; the durations are inversely proportional to the region-mean velocities of relative plate motions along the fault zones. This indicates that the durations of the failure cycle are mainly determined by the velocities of tectonic deformations. The significant scatter in the failure cycle duration values within regions testifies to the substantially heterogeneous intraregional distribution of the strain rates and strength, which is consistent with up-to-date notions of the hierarchical nature of a geological medium and mosaicity of the stress field.

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Section: Discussionsupporting

confidence: 78%

Estimates of Lithospheric Failure Cycle Parameters from Regional Earthquake Catalogues

Смирнов

Ommi

Potanina

et al. 2019

Izv., Phys. Solid Earth

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“…There is still much controversy over the time variation pattern of b values in the source area before a strong earthquake. Although the b values to drop prior to failure was found in laboratory fracturing experiments on relatively complete rock samples (e.g., Thompson et al, 2006;Lei, 2019), and the case study of strong earthquakes (Nanjo et al, 2012;Schurr et al, 2014;Bayrak et al, 2017;Huang et al, 2020), but a large number of reported b values time variation before actual strong earthquakes are still considered to have no statistically significant predictive power (Parsons, 2007), or some studies have found that the temporal variation of b values corresponding to asperities are synchronized with loading rate and shear stress (Tormann et al, 2013). Schorlemmer et al (2004) and Wiemer and Wyss (2002) studied some earthquake cases and concluded that the b value is quite stable over time and it is difficult to observe a significant change.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Heterogeneity of b Values Revealed by a Data-Driven Approach for June 17, 2019 MS 6.0, Changning Sichuan, China earthquake Sequence

Jiang¹,

Han²,

Feng³

et al. 2021

Preprint

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Abstract. The spatiotemporal heterogeneity of b values has great potential for understanding the seismogenic process and assessing the seismic hazard. However, there is still much controversy about whether it exists or not, and an important reason is that the choice of subjective parameters has eroded the foundations of many researches. To overcome this problem, we used a recent developed non-parametric method based on the data-driven concept to calculate b values. The major steps of this method include: 1) perform a large number of Voronoi tessellation, Bayesian information criterion (BIC) value calculation and selection of the optimal models for the study area, and 2) use the ensemble median (Q2) and median absolute deviation (MAD) value to represent the final b value and its uncertainty. We investigated spatiotemporal variations of b values before and after the 2019 Changning MS 6.0 earthquake in Sichuan Basin, China. The results reveal a spatial volume with low pre-mainshock b values near the mainshock source region, and its size corresponds roughly with the rupture area of the mainshock. The anomalously high pre-mainshock b values distributed in the NE direction of the epicenter was interpreted to be related with fluid invasion or increased pore pressure. The decreases of b values during the aftershock sequence along with the occurrences of several strong aftershocks imply that b values could be an indicator of stress state. In addition, we found that although the distribution characteristics of b values obtained from different way of investigating are qualitatively consistent, they differ significantly in terms of their specific values, suggesting that the best way to study the heterogeneous pattern of b values is in the joint dimension of space-time rather than alone in time and space. Overall, our study emphasizes the importance of b value studies on assessing the earthquake hazards.

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“…For example, Bayrak and Bayrak (2012) and Öztürk (2015) studied the correlations between seismotectonic b-value and Dc-value in the western Anatolia. Recently, Bayrak et al (2017) determined the temporal and spatial variations of Gutenberg-Richter parameter (b) and fractal dimensions (Dc) using the earthquakes with magnitude 2.0≤ Ms ≤7.7 between 1900 and 2010 for whole western Anatolia. Çoban and Sayıl (2019) investigated the Bodrum-Kos earthquake (21 July 2017, Mw=6.5) and calculated the Weibull, gamma, lognormal, and Rayleigh distribution models parameters by using the inner-event time of earthquake recurrences.…”

Section: Introductionmentioning

confidence: 99%

THE SPATIAL ANALYSIS OF b-VALUES OF THE AREA BETWEEN BODRUM AND FETHIYE DISTRICTS, THE SOUTH-WESTERN ANATOLIA, TURKEY

AKAR

Akkoyunlu

Bilim

2022

Mühendislik Bilimleri Ve Tasarım Dergisi

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The estimation of the variation of the b-value, which is frequency distribution of a magnitude given in an earthquake data set of any region, is important parameter for interpretation of tectonic mechanism and seismic hazard assessment of that region. There is an inverse correlation between stress and b-value. The magnitudefrequency relationship is described by the well-known the Gutenberg-Richter relationship. The purpose of this paper is to investigate the recent seismicity of the region between the Bodrum and Fethiye, the south-western Anatolia in Turkey. A total of 27357 earthquake data is taken into account in this study in the period between 2004 to 2020 with magnitude (Ml) larger than 2. The majority of focal depths of earthquakes are concentrated between 0 and 33 km. The b-value in the Gutenberg-Richter relationship was estimated by the maximum likelihood method in this study. The estimated b-values range between 0.5 and 2 in the study region. While the lower b-values (0.5-1) are located at the SE of the study area (mainly the Beydağları unit), higher values (1-2) are trending on the west-east direction along the fault zones. The highest b-values in the study area are possibly related with the brittle lower-mid crust, thermal regime, normal faults and young basins bounded by these faults.

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Temporal and spatial variations of Gutenberg-Richter parameter and fractal dimension in Western Anatolia, Turkey

Cited by 18 publications

References 80 publications

Estimates of Lithospheric Failure Cycle Parameters from Regional Earthquake Catalogues

Estimates of Lithospheric Failure Cycle Parameters from Regional Earthquake Catalogues

Spatiotemporal Heterogeneity of <i>b</i> Values Revealed by a Data-Driven Approach for June 17, 2019 <i>M</i><sub>S</sub> 6.0, Changning Sichuan, China earthquake Sequence

THE SPATIAL ANALYSIS OF b-VALUES OF THE AREA BETWEEN BODRUM AND FETHIYE DISTRICTS, THE SOUTH-WESTERN ANATOLIA, TURKEY

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Temporal and spatial variations of Gutenberg-Richter parameter and fractal dimension in Western Anatolia, Turkey

Cited by 18 publications

References 80 publications

Estimates of Lithospheric Failure Cycle Parameters from Regional Earthquake Catalogues

Estimates of Lithospheric Failure Cycle Parameters from Regional Earthquake Catalogues

Spatiotemporal Heterogeneity of &lt;i&gt;b&lt;/i&gt; Values Revealed by a Data-Driven Approach for June 17, 2019 &lt;i&gt;M&lt;/i&gt;&lt;sub&gt;S&lt;/sub&gt; 6.0, Changning Sichuan, China earthquake Sequence

THE SPATIAL ANALYSIS OF b-VALUES OF THE AREA BETWEEN BODRUM AND FETHIYE DISTRICTS, THE SOUTH-WESTERN ANATOLIA, TURKEY

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Spatiotemporal Heterogeneity of <i>b</i> Values Revealed by a Data-Driven Approach for June 17, 2019 <i>M</i><sub>S</sub> 6.0, Changning Sichuan, China earthquake Sequence