{"title":"On the Relationship between RTL and b-Value Anomalies of Seismicity","authors":"V. B. Smirnov, A. A. Petrushov","doi":"10.1134/S1069351325700545","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—The essay prepared for the issue of the journal to honor the memory of G.A. Sobolev reflects the history of creation and describes the physical foundations of the method for detecting precursory <i>RTL</i> anomalies of seismicity proposed by G.A. Sobolev in 1995. The physical ideas precursory patterns in <i>RTL</i> parameter and Gutenberg–Richter <i>b</i>-value are discussed from the standpoint of the avalanche-unstable fracture formation (AUF) concept. The previous results on the comparison of the <i>RTL</i> and <i>b</i>-value anomalies revealed in a number of regions pertaining to different tectonic types (subduction zones, rift and shear zones) are summarized. Issues associated with <i>RTL</i> and <i>b-</i>value calculation methods are discussed. The manifestations of the anomalies in the regions pertaining to different tectonic types share common patterns and have regional differences. In the shear zones, the temporal sequence of the beginnings of seismic quiescence stages (<i>RTL</i> parameter) and changes in the energy “spectrum” of seismicity (<i>b-</i>value) proved to be inverse to the temporal sequence of stages observed in the subduction zones and in the rift zone. At the same time, in all regions, irrespective of their tectonic type, the temporal sequence of the stages of <i>b-</i>value anomaly formation and seismicity activation is identical: activation begins later than the <i>b-</i>value begins to decrease. This pattern corresponds to the scenario following from the AUF concept, thus confirming the validity of this concept in tectonically diverse regions.</p>","PeriodicalId":602,"journal":{"name":"Izvestiya, Physics of the Solid Earth","volume":"61 4","pages":"539 - 552"},"PeriodicalIF":1.0000,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Izvestiya, Physics of the Solid Earth","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S1069351325700545","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
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Abstract—The essay prepared for the issue of the journal to honor the memory of G.A. Sobolev reflects the history of creation and describes the physical foundations of the method for detecting precursory RTL anomalies of seismicity proposed by G.A. Sobolev in 1995. The physical ideas precursory patterns in RTL parameter and Gutenberg–Richter b-value are discussed from the standpoint of the avalanche-unstable fracture formation (AUF) concept. The previous results on the comparison of the RTL and b-value anomalies revealed in a number of regions pertaining to different tectonic types (subduction zones, rift and shear zones) are summarized. Issues associated with RTL and b-value calculation methods are discussed. The manifestations of the anomalies in the regions pertaining to different tectonic types share common patterns and have regional differences. In the shear zones, the temporal sequence of the beginnings of seismic quiescence stages (RTL parameter) and changes in the energy “spectrum” of seismicity (b-value) proved to be inverse to the temporal sequence of stages observed in the subduction zones and in the rift zone. At the same time, in all regions, irrespective of their tectonic type, the temporal sequence of the stages of b-value anomaly formation and seismicity activation is identical: activation begins later than the b-value begins to decrease. This pattern corresponds to the scenario following from the AUF concept, thus confirming the validity of this concept in tectonically diverse regions.
期刊介绍：
Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.
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