globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228450
论文题名:
Crustal seismicity in the Andean Precordillera of Argentina using seismic broadband data
作者: Venerdini A.; Alvarado P.; Ammirati J.-B.; Podesta M.; López L.; Fuentes F.; Linkimer L.; Beck S.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 786
语种: 英语
中文关键词: Andean retroarc ; Crust ; Flat slab ; Focal mechanism ; Fold-thrust belt ; South 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
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
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170724
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


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

Recommended Citation:
Venerdini A.,Alvarado P.,Ammirati J.-B.,et al. Crustal seismicity in the Andean Precordillera of Argentina using seismic broadband data[J]. Tectonophysics,2020-01-01,786
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Venerdini A.]'s Articles
[Alvarado P.]'s Articles
[Ammirati J.-B.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Venerdini A.]'s Articles
[Alvarado P.]'s Articles
[Ammirati J.-B.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Venerdini A.]‘s Articles
[Alvarado P.]‘s Articles
[Ammirati J.-B.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.