{"title":"1996 年 Chimbote-Peru 海啸地震(7.5 级)的数值模拟","authors":"Cesar Jimenez , Yuchen Wang","doi":"10.1016/j.pepi.2024.107154","DOIUrl":null,"url":null,"abstract":"<div><p>The earthquake of Chimbote occurred on February 21, 1996 in the northern region of Peru. Despite its relatively small magnitude, it generated a tsunami of 2–3 m height in Chimbote, taking the lives of 12 people. We conducted the signal processing of 31 broadband teleseismic stations, and waveform inversion to obtain the slip distribution and source time function, which indicated a multiple rupture process. The rupture process had a duration of 70 s, a rather high value for a relatively small earthquake. The calculated scalar seismic moment was <span><math><mn>2.19</mn><mo>×</mo><msup><mn>10</mn><mn>20</mn></msup></math></span> Nm, corresponding to a moment magnitude of Mw 7.5. The slip distribution was heterogeneous, with a maximum slip of 8.9 m around the main asperity concentrated in an area of <span><math><mn>30</mn><mo>×</mo><mn>30</mn><mspace></mspace><msup><mi>km</mi><mn>2</mn></msup></math></span>, for an constrained rigidity of <span><math><mn>1.46</mn><mo>×</mo><msup><mn>10</mn><mn>10</mn></msup><mspace></mspace><mi>N</mi><mo>/</mo><msup><mi>m</mi><mn>2</mn></msup></math></span>. We also calculated the vertical coseismic deformation for 45 subfaults, which was used as an initial condition for the tsunami propagation modelling. Simulated tsunami waveforms were calculated for Salaverry (<span><math><msub><mi>H</mi><mi>max</mi></msub><mo>=</mo><mn>0.81</mn></math></span> m), Santa (<span><math><msub><mi>H</mi><mi>max</mi></msub><mo>=</mo><mn>4.62</mn></math></span> m) and Chimbote (<span><math><msub><mi>H</mi><mi>max</mi></msub><mo>=</mo><mn>2.67</mn></math></span> m) tidal stations.</p></div>","PeriodicalId":54614,"journal":{"name":"Physics of the Earth and Planetary Interiors","volume":"348 ","pages":"Article 107154"},"PeriodicalIF":2.4000,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Numerical modelling of the 1996 Chimbote-Peru tsunami earthquake (Mw 7.5)\",\"authors\":\"Cesar Jimenez , Yuchen Wang\",\"doi\":\"10.1016/j.pepi.2024.107154\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The earthquake of Chimbote occurred on February 21, 1996 in the northern region of Peru. Despite its relatively small magnitude, it generated a tsunami of 2–3 m height in Chimbote, taking the lives of 12 people. We conducted the signal processing of 31 broadband teleseismic stations, and waveform inversion to obtain the slip distribution and source time function, which indicated a multiple rupture process. The rupture process had a duration of 70 s, a rather high value for a relatively small earthquake. The calculated scalar seismic moment was <span><math><mn>2.19</mn><mo>×</mo><msup><mn>10</mn><mn>20</mn></msup></math></span> Nm, corresponding to a moment magnitude of Mw 7.5. The slip distribution was heterogeneous, with a maximum slip of 8.9 m around the main asperity concentrated in an area of <span><math><mn>30</mn><mo>×</mo><mn>30</mn><mspace></mspace><msup><mi>km</mi><mn>2</mn></msup></math></span>, for an constrained rigidity of <span><math><mn>1.46</mn><mo>×</mo><msup><mn>10</mn><mn>10</mn></msup><mspace></mspace><mi>N</mi><mo>/</mo><msup><mi>m</mi><mn>2</mn></msup></math></span>. We also calculated the vertical coseismic deformation for 45 subfaults, which was used as an initial condition for the tsunami propagation modelling. Simulated tsunami waveforms were calculated for Salaverry (<span><math><msub><mi>H</mi><mi>max</mi></msub><mo>=</mo><mn>0.81</mn></math></span> m), Santa (<span><math><msub><mi>H</mi><mi>max</mi></msub><mo>=</mo><mn>4.62</mn></math></span> m) and Chimbote (<span><math><msub><mi>H</mi><mi>max</mi></msub><mo>=</mo><mn>2.67</mn></math></span> m) tidal stations.</p></div>\",\"PeriodicalId\":54614,\"journal\":{\"name\":\"Physics of the Earth and Planetary Interiors\",\"volume\":\"348 \",\"pages\":\"Article 107154\"},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2024-02-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics of the Earth and Planetary Interiors\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0031920124000128\",\"RegionNum\":3,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of the Earth and Planetary Interiors","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0031920124000128","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Numerical modelling of the 1996 Chimbote-Peru tsunami earthquake (Mw 7.5)
The earthquake of Chimbote occurred on February 21, 1996 in the northern region of Peru. Despite its relatively small magnitude, it generated a tsunami of 2–3 m height in Chimbote, taking the lives of 12 people. We conducted the signal processing of 31 broadband teleseismic stations, and waveform inversion to obtain the slip distribution and source time function, which indicated a multiple rupture process. The rupture process had a duration of 70 s, a rather high value for a relatively small earthquake. The calculated scalar seismic moment was Nm, corresponding to a moment magnitude of Mw 7.5. The slip distribution was heterogeneous, with a maximum slip of 8.9 m around the main asperity concentrated in an area of , for an constrained rigidity of . We also calculated the vertical coseismic deformation for 45 subfaults, which was used as an initial condition for the tsunami propagation modelling. Simulated tsunami waveforms were calculated for Salaverry ( m), Santa ( m) and Chimbote ( m) tidal stations.
期刊介绍:
Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors.
Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.