Ashish Pal, Dilip Kumar Yadav, Naresh Kumar, Abhishek Kumar Gupta, Ajay Paul, H C Nainwal
{"title":"印度东北部 Siang 谷当地地震震源参数建模及其地震构造影响","authors":"Ashish Pal, Dilip Kumar Yadav, Naresh Kumar, Abhishek Kumar Gupta, Ajay Paul, H C Nainwal","doi":"10.1007/s12040-024-02272-9","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A moderate size earthquake (M<sub>L</sub> 5.9) occurred near Mechuka in Siang Valley on 23rd April 2019 at 20:15:50.00 UTC in the rupture zone of the great Assam earthquake of 15th August 1950. This shallow-focused earthquake occurred close to NE trending Main Central Thrust has a thrust fault mechanism striking parallel to this major tectonics of the Himalaya. Including this event, a dataset of 46 local, micro and low magnitude earthquakes (1.5 ≤ M<sub>L</sub> ≤ 5.9) of the Siang Valley of Arunachal Pradesh, NE India, are evaluated for the characteristics of the earthquake source, seismicity, stress drop and tectonic structures. The earthquake events were recorded by a close digital network of eight broadband seismic stations installed in December 2018 in the Siang Valley. The stress drop (<i>Δσ</i>) obtained for the Mechuka earthquake in the Siang Valley is 114.71 bars, the seismic moment (<i>Mo</i>) of 6.86E + 16 Nm and the source radius (<i>r</i>) of 1392.41 m. The seismic moments obtained from the microearthquakes vary between 2.44E + 11 and 6.86E + 16 Nm, and the source radius varies from 172.90 to 1392.41 m based on Brune’s circular source model 1970. The corner frequencies (<i>fc</i>) of the events range from 1.03 to 8.04 Hz. Seismically intense clustering of microearthquakes has a low-stress drop below 10 bar except for the Mechuka earthquake, which varies from 0.05 to 114.72. This high-stress drop of moderate earthquake compared to its low values of lower magnitude earthquakes indicates that the earthquake of 23rd April 2019 is associated with high-strength material accumulating high strain during the earthquake-building process. Moment magnitude of whole data set ranges from 1.52 to 5.16. The scaling relationship between <i>Mo</i> and <i>fc</i> is obtained as 9.089E + 16<i>fc</i><sup>–9.52</sup>, and for <i>Mo</i> and <i>Δσ</i> are modelled to be related as <i>Mo</i> = 8.96E + 10<i>Δσ</i><sup>2.86</sup>. Evaluated low-stress drop for the smaller size of earthquakes shows brittleness of the upper crustal region.</p><h3 data-test=\"abstract-sub-heading\">Research highlights</h3><ul>\n<li>\n<p>Modelling of earthquake source parameters to obtain scaling relations for Siang Valley, Arunachal Pradesh.</p>\n</li>\n<li>\n<p>The estimated <i>Mo, fc, r, ∆σ</i> and <i>Mw</i> are 2.44 × 10<sup>11</sup> to 6.86 × 10<sup>16</sup> Nm, 1.03–8.04 Hz, 172.90–1392.41 m, 0.05–114.71 bar and 1.52–5.16, respectively.</p>\n</li>\n<li>\n<p>Scaling relation between <i>Mo</i> and <i>fc</i>, <i>Mo a</i>nd <i>Δσ</i> and <i>Mw</i> and <i>fc</i> is <i>Mo</i> = 9.089E + 16<i>fc</i><sup>−9.52</sup>, <i>Mo</i> = 8.96E + 10 Δσ<sup>2.86</sup> and Log <i>fc</i> = –0.39<i>Mw</i> + 2.39, respectively.</p>\n</li>\n</ul>","PeriodicalId":15609,"journal":{"name":"Journal of Earth System Science","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Modelling of source parameters of local earthquakes and seismotectonic implications in Siang Valley, NE India\",\"authors\":\"Ashish Pal, Dilip Kumar Yadav, Naresh Kumar, Abhishek Kumar Gupta, Ajay Paul, H C Nainwal\",\"doi\":\"10.1007/s12040-024-02272-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3 data-test=\\\"abstract-sub-heading\\\">Abstract</h3><p>A moderate size earthquake (M<sub>L</sub> 5.9) occurred near Mechuka in Siang Valley on 23rd April 2019 at 20:15:50.00 UTC in the rupture zone of the great Assam earthquake of 15th August 1950. This shallow-focused earthquake occurred close to NE trending Main Central Thrust has a thrust fault mechanism striking parallel to this major tectonics of the Himalaya. Including this event, a dataset of 46 local, micro and low magnitude earthquakes (1.5 ≤ M<sub>L</sub> ≤ 5.9) of the Siang Valley of Arunachal Pradesh, NE India, are evaluated for the characteristics of the earthquake source, seismicity, stress drop and tectonic structures. The earthquake events were recorded by a close digital network of eight broadband seismic stations installed in December 2018 in the Siang Valley. The stress drop (<i>Δσ</i>) obtained for the Mechuka earthquake in the Siang Valley is 114.71 bars, the seismic moment (<i>Mo</i>) of 6.86E + 16 Nm and the source radius (<i>r</i>) of 1392.41 m. The seismic moments obtained from the microearthquakes vary between 2.44E + 11 and 6.86E + 16 Nm, and the source radius varies from 172.90 to 1392.41 m based on Brune’s circular source model 1970. The corner frequencies (<i>fc</i>) of the events range from 1.03 to 8.04 Hz. Seismically intense clustering of microearthquakes has a low-stress drop below 10 bar except for the Mechuka earthquake, which varies from 0.05 to 114.72. This high-stress drop of moderate earthquake compared to its low values of lower magnitude earthquakes indicates that the earthquake of 23rd April 2019 is associated with high-strength material accumulating high strain during the earthquake-building process. Moment magnitude of whole data set ranges from 1.52 to 5.16. The scaling relationship between <i>Mo</i> and <i>fc</i> is obtained as 9.089E + 16<i>fc</i><sup>–9.52</sup>, and for <i>Mo</i> and <i>Δσ</i> are modelled to be related as <i>Mo</i> = 8.96E + 10<i>Δσ</i><sup>2.86</sup>. Evaluated low-stress drop for the smaller size of earthquakes shows brittleness of the upper crustal region.</p><h3 data-test=\\\"abstract-sub-heading\\\">Research highlights</h3><ul>\\n<li>\\n<p>Modelling of earthquake source parameters to obtain scaling relations for Siang Valley, Arunachal Pradesh.</p>\\n</li>\\n<li>\\n<p>The estimated <i>Mo, fc, r, ∆σ</i> and <i>Mw</i> are 2.44 × 10<sup>11</sup> to 6.86 × 10<sup>16</sup> Nm, 1.03–8.04 Hz, 172.90–1392.41 m, 0.05–114.71 bar and 1.52–5.16, respectively.</p>\\n</li>\\n<li>\\n<p>Scaling relation between <i>Mo</i> and <i>fc</i>, <i>Mo a</i>nd <i>Δσ</i> and <i>Mw</i> and <i>fc</i> is <i>Mo</i> = 9.089E + 16<i>fc</i><sup>−9.52</sup>, <i>Mo</i> = 8.96E + 10 Δσ<sup>2.86</sup> and Log <i>fc</i> = –0.39<i>Mw</i> + 2.39, respectively.</p>\\n</li>\\n</ul>\",\"PeriodicalId\":15609,\"journal\":{\"name\":\"Journal of Earth System Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2024-04-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Earth System Science\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1007/s12040-024-02272-9\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Earth System Science","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s12040-024-02272-9","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Modelling of source parameters of local earthquakes and seismotectonic implications in Siang Valley, NE India
Abstract
A moderate size earthquake (ML 5.9) occurred near Mechuka in Siang Valley on 23rd April 2019 at 20:15:50.00 UTC in the rupture zone of the great Assam earthquake of 15th August 1950. This shallow-focused earthquake occurred close to NE trending Main Central Thrust has a thrust fault mechanism striking parallel to this major tectonics of the Himalaya. Including this event, a dataset of 46 local, micro and low magnitude earthquakes (1.5 ≤ ML ≤ 5.9) of the Siang Valley of Arunachal Pradesh, NE India, are evaluated for the characteristics of the earthquake source, seismicity, stress drop and tectonic structures. The earthquake events were recorded by a close digital network of eight broadband seismic stations installed in December 2018 in the Siang Valley. The stress drop (Δσ) obtained for the Mechuka earthquake in the Siang Valley is 114.71 bars, the seismic moment (Mo) of 6.86E + 16 Nm and the source radius (r) of 1392.41 m. The seismic moments obtained from the microearthquakes vary between 2.44E + 11 and 6.86E + 16 Nm, and the source radius varies from 172.90 to 1392.41 m based on Brune’s circular source model 1970. The corner frequencies (fc) of the events range from 1.03 to 8.04 Hz. Seismically intense clustering of microearthquakes has a low-stress drop below 10 bar except for the Mechuka earthquake, which varies from 0.05 to 114.72. This high-stress drop of moderate earthquake compared to its low values of lower magnitude earthquakes indicates that the earthquake of 23rd April 2019 is associated with high-strength material accumulating high strain during the earthquake-building process. Moment magnitude of whole data set ranges from 1.52 to 5.16. The scaling relationship between Mo and fc is obtained as 9.089E + 16fc–9.52, and for Mo and Δσ are modelled to be related as Mo = 8.96E + 10Δσ2.86. Evaluated low-stress drop for the smaller size of earthquakes shows brittleness of the upper crustal region.
Research highlights
Modelling of earthquake source parameters to obtain scaling relations for Siang Valley, Arunachal Pradesh.
The estimated Mo, fc, r, ∆σ and Mw are 2.44 × 1011 to 6.86 × 1016 Nm, 1.03–8.04 Hz, 172.90–1392.41 m, 0.05–114.71 bar and 1.52–5.16, respectively.
Scaling relation between Mo and fc, Mo and Δσ and Mw and fc is Mo = 9.089E + 16fc−9.52, Mo = 8.96E + 10 Δσ2.86 and Log fc = –0.39Mw + 2.39, respectively.
期刊介绍：
The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’.
The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria.
The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region.
A model study is carried out to explain observations reported either in the same manuscript or in the literature.
The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.
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