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2021年江苏天宁MS4.2地震前后b值与视应力时空变化特征研究
Dizhen xuebao本文以 （29°N—37°N，117°E—124°E）为研究区，基于该区域 2014—2023 年的地震目录与波形数据，通过分析江苏天宁 MS4.2 地震前后的 b 值与差视应力变化，探究该地震前震源区是否存在应力累积过程。结果表明：2019 年4月至2020 年 2 月，天宁MS4.2地震周边区域b值呈上升趋势；2020 年 2 月后 b 值转为下降，且该趋势持续至地震发生；差视应力则呈现三阶段变化：2019 年12 月前呈下降趋势，2020 年1月至2021年7月转为上升后再次下降。天宁地震发生前 ...
Fang Liu +5 more
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Are volcanic seismic b -values high, and if so when? [PDF]
Journal of Volcanology and Geothermal Research, 2015 Abstract The Gutenberg–Richter exponent b is a measure of the relative proportion of large and small earthquakes. It is commonly used to infer material properties such as heterogeneity, or mechanical properties such as the state of stress from earthquake populations.
Roberts, Nick. S. +2 more
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Magnitude probabilities for extreme earthquakes around the globe with Rank-Ordering
Геофизический журналEarthquake likelihoods have occupied humankind ever since, and the estimation of potential magnitudes is crucial for a multitude of aspects of safety. In this work, we present a probabilistic analysis of extreme magnitudes in 16 regions across the globe ...
Gisela Domej
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Dizhen xuebao, 2020 采用双差定位方法对2019年1月1日至2019年10月20日期间四川区域台网记录到的地震进行重定位，得到7 030个重定位事件，并获得了四川长宁MS6.0地震序列较准确的空间分布，并据此计算了震后长宁震源区的平均b值，分析了地震序列的活动性；利用近震全波形拟合方法获得了主震及4次MS≥5.0地震的震源机制解和矩心深度，初步分析了本次地震序列的发震构造，获得如下主要结果：① 四川长宁余震序列呈NW−SE向分布，余震深度分布整体呈现出西深东浅的趋势，且西部地区地震的频度远远高于东部地区；② b值空间分布显示，
Zhiguo Xu +5 more
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b-Values Observations in Taiwan: A Review
Terrestrial, Atmospheric and Oceanic Sciences, 2015 High seismicity with spatial heterogeneity in Taiwan makes this region one of the best natural laboratories for seismological researches. Numerous seismicity studies, including the b-value, have been performed for more than one century. One of the possible ways to mitigate seismic risk is predicting an impending earthquake through various kinds of ...
Jeen-Hwa Wang +3 more
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PEMETAAN MAGNITUDE OF COMPLETENESS (Mc) UNTUK GEMPA DI WILAYAH BENGKULU
JGEDengan menggunakan data gempa bumi dari katalog USGS dan BMKG dari tahun 2009 hingga 2021, penelitian dilakukan untuk mengestimasi nilai Mc, nilai-b, dan nilai-a. Gempa bumi terjadi pada 6° LS - 2° LU dan 100° BT - 103° BT, dengan magnitudo 3 SR hingga 7
Ridwan Hanafi +2 more
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Positively closed Sh(B)-valued models
Annals of Pure and Applied LogicWe study positively closed and strongly positively closed topos-valued models of coherent theories. Positively closed is a global notion (it is defined in terms of all possible outgoing homomorphisms), while strongly positively closed is a local notion (it only concerns the definable sets inside the model).
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Discover GeoscienceAn unbiased estimate of Gutenberg-Richter’s b-value and its uncertainty is the most important step for performing a realistic seismic hazard assessment.
Suman Sinha, Jerin Paul K
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Variation of b Value for Axial DWI Prostate MR Imaging in Cancer: Which b Value is Optimal?
Proceedings Series on Health & Medical SciencesBackground: Diffusion Weighted Imaging (DWI) is a technique that visualizes the movement of water molecules from areas of higher to lower concentration. In DWI sequences, the b-value parameter affects the signal intensity in the images. The objective of this study is to describe the differences in anatomical image information between b-value variations
Nurul Agustina +4 more
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Spatial variations of b-values in the subduction zone of Central America [PDF]
Geofísica Internacional, 2003 Frequency-magnitude distribution along the Mid-American Trench (MAT) has been studied by means of 2345 earthquakes during the period 1964-1994. We used the regional MIDAS catalogue with a magnitude of completeness of 4.2.
Ota Kulhánek, David A. Monterroso
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