Climate Change Data Portal
| DOI | 10.1016/j.tecto.2020.228450 |
| Crustal seismicity in the Andean Precordillera of Argentina using seismic broadband data | |
| Venerdini A.; Alvarado P.; Ammirati J.-B.; Podesta M.; López L.; Fuentes F.; Linkimer L.; Beck S. | |
| 发表日期 | 2020 |
| ISSN | 00401951 |
| 卷号 | 786 |
| 英文摘要 | In this study, we analyze 100 crustal Precordilleran earthquakes recorded in 2008 and 2009 by 52 broadband seismic stations from the SIEMBRA and ESP, two temporary experiments deployed in the Pampean flat slab region, between the Andean Cordillera and the Sierras Pampeanas in the Argentine Andean backarc region. In order to determine more accurate hypocenters, focal mechanisms and regional stress orientations, we relocated 100 earthquakes using the JHD technique and a local velocity model. The focal depths of our relocated events vary between 6 and 50 km. We estimated local magnitudes between 0.4 ≤ ML ≤ 5.3 and moment magnitudes between 1.3 ≤ Mw ≤ 5.3. Focal mechanisms were determined from new hypocenter relocations and first motion P-wave polarities. Our solutions exhibit a majority of the earthquakes with reverse faulting mechanism. Regional stress tensor from the inversion of P- and T-axis orientations, shows a maximum stress axis (σ1) almost horizontal with a strike of 85° and a minimum stress axis (σ3) almost vertical. We correlate this small-to-moderate magnitude seismicity with the presence of large basement structures beneath the Iglesia-Calingasta Basin in the west and the Eastern Precordillera in the east. The nucleation of deep earthquakes beneath the Iglesia Basin could be related to the presence of a major ramp accommodating the crustal shortening between the Frontal Cordillera and the Precordillera. The crustal seismicity beneath the Precordillera seems to correlate with west-dipping structures rooting deep into the Cuyania basement suggesting a thick-skinned basement deformation system beneath the Precordillera and its shallow thin-skinned fold and thrust belt. © 2020 |
| 关键词 | Andean retroarcCrustFlat slabFocal mechanismFold-thrust beltSouth America |
| 英文关键词 | Buildings; Faulting; Seismic waves; Basement structures; Broad-band seismic stations; Crustal shortening; Fold-and-thrust belts; Hypocenter relocation; Moment magnitudes; Sierras pampeanas; Stress orientations; Earthquakes; crustal shortening; crustal structure; earthquake hypocenter; earthquake magnitude; focal mechanism; fold and thrust belt; P-wave; seismic data; seismic moment; seismicity; stress; Argentina |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207891 |
| 作者单位 | Grupo de Sismotectónica, Centro de Investigaciones de la Geósfera y la Biósfera (Consejo Nacional de Investigaciones Científicas y Técnicas CONICET– Facultad de Ciencias Exactas, Físicas y Naturales, UNSJ), San Juan, Argentina; Departamento de Geofísica y Astronomía, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, San Juan, Argentina; Instituto Nacional de Prevención Sísmica, San Juan, Argentina; YPF S.A., Buenos Aires, Argentina; Escuela Centroamericana de Geología, Universidad de Costa Rica, San José, Costa Rica; Department of Geosciences, University of Arizona, Tucson, AZ, United States |
| 推荐引用方式 GB/T 7714 | Venerdini A.,Alvarado P.,Ammirati J.-B.,et al. Crustal seismicity in the Andean Precordillera of Argentina using seismic broadband data[J],2020,786. |
| APA | Venerdini A..,Alvarado P..,Ammirati J.-B..,Podesta M..,López L..,...&Beck S..(2020).Crustal seismicity in the Andean Precordillera of Argentina using seismic broadband data.Tectonophysics,786. |
| MLA | Venerdini A.,et al."Crustal seismicity in the Andean Precordillera of Argentina using seismic broadband data".Tectonophysics 786(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
