Results 21 to 30 of about 354 (204)

Enhanced 3D velocity structure, seismicity relocation and basement characterization of Changning shale gas and salt mining regions in southern Sichuan basin

Frontiers in Earth Science, 2023
Current extensive seismicity in southern Sichuan Basin is ascribed to the reactivation of pre-existing faults, as a result of prolonged fluid injection for salt mining and shale gas development, respectively.
Uzonna Okenna Anyiam, Haijiang Zhang, Haijiang Zhang, Yuyang Tan, Jiawei Qian, Lei Gao, Ying Liu, Kezhen Zuo, Cuiping Zhao   +8 more
doaj   +1 more source

Lithospheric structure of the Pampean flat slab region from double-difference tomography

Journal of South American Earth Sciences, 2020
Abstract We obtain earthquake locations and a detailed three-dimensional velocity model of the flat slab subduction zone in west-central Argentina (latitudes: 32-30°S and longitudes: 70-66°W) using a regional-scale double-difference tomography algorithm with earthquake data recorded by the SIEMBRA (2007–2009) and ESP (2008–2010) broadband seismic ...
Linkimer Abarca, Lepolt, Beck, Susan L., Zandt, George, Alvarado, Patricia Mónica, Anderson, Megan L., Gilbert, Hersh J., Zhang, Haijiang   +6 more
openaire   +5 more sources

3‐D refractivity field from GPS double difference tomography [PDF]

Geophysical Research Letters, 2002
GPS meteorology can be successfully used to model the tropospheric refraction effect on radiowave signals. We describe an approach to estimate and model the spatial distribution of the tropospheric water vapor. We refine the tomographic software package AWATOS which is based on the assimilation of GPS double difference observations.
M. Troller, B. Bürki, M. Cocard, A. Geiger, H.‐G. Kahle   +4 more
openaire   +1 more source

Imaging the New Madrid Seismic Zone using double‐difference tomography [PDF]

Journal of Geophysical Research: Solid Earth, 2013
AbstractThree‐dimensional P and S wave velocity (VP and VS) models and high‐resolution earthquake relocations are determined for the New Madrid Seismic Zone using double‐difference local earthquake tomography. The data set consists of arrival times and differential times recorded by the Cooperative New Madrid Seismic Network (CNMSN) from 2000 to 2007 ...
Meredith Dunn, Heather R. DeShon, Christine A. Powell   +2 more
openaire   +1 more source

Velocity structure and the role of fluids in the West Bohemia Seismic Zone [PDF]

Solid Earth, 2014
In this study, we apply the double-difference tomography to investigate the detailed 3-D structure within and around the Nový Kostel Seismic Zone, an area in the Czech Republic known for frequent occurrences of earthquake swarms.
C. Alexandrakis, M. Calò, F. Bouchaala, V. Vavryčuk   +3 more
doaj   +1 more source

Determination of Efficacy of Single and Double 4.7 mg Deslorelin Acetate Implant on the Reproductive Activity of Female Pond Sliders (Trachemys scripta)

Animals, 2021
The use of long-acting gonadotropin-releasing hormone (GnRH) agonists to suppress fertility has been poorly investigated in reptiles, and the few available studies show inconsistent results.
Edoardo Bardi, Martina Manfredi, Raffaella Capitelli, Emanuele Lubian, Alessandro Vetere, Alessandro Montani, Tommaso Bertoni, Elisa Talon, Gabriele Ratti, Stefano Romussi   +9 more
doaj   +1 more source

Double-difference seismic attenuation tomography method and its application to The Geysers geothermal field, California [PDF]

Geophysical Journal International, 2021
SUMMARY Knowledge of attenuation structure is important for understanding subsurface material properties. We have developed a double-difference seismic attenuation (DDQ) tomography method for high-resolution imaging of 3-D attenuation structure. Our method includes two main elements, the inversion of event-pair differential ${t^*}$ ($d{t^
Hao Guo, Clifford Thurber
openaire   +1 more source

利用双差层析成像方法反演阿拉斯加地区岩石圈速度结构

Dizhen xuebao, 2022
阿拉斯加地区由不同地质时期的地体向北增生而成，经历了漫长的构造演化，地质构造复杂。ANF （Array Network Facility）网站新近提供的来自USArray地震台网记录的地震台站观测数据填补了阿拉斯加地区西部和北部的观测空白，本文选取该区域中345个台站记录的5 638个地震事件的P波、S波到时数据，采用区域双差地震层析成像方法反演得到了该地区的岩石圈三维P波速度模型和地震重定位结果。研究结果显示：阿拉斯加西部太平洋板块的俯冲倾角较大，深部地幔楔表现为P波低速异常 ...
Shaoxian Zhou, Mei Xue
doaj   +1 more source

Double-difference/slope tomography by a variational projection approach

, 2019
Dense acquisition are more and more available in exploration and earthquake seismology. Tomographic approaches can now consider not only travel times but also the wavefront itself across the seismic network (Zhang and Thurber, 2003; Yuan et al., 2016). For dense controlled-source seismic experiments, double differences of travel times between receivers
Serge Sambolian, Stéphane Operto, Alessandra Ribodetti, Jean Virieux   +3 more
openaire   +1 more source

Tectonic Pattern Imaging of Southern Sumatra Region Using Double Difference Seismic Tomography

EKSPLORIUM, 2022
Southern Sumatra and its surroundings are close to the contact zone of the Indo-Australian plate and Eurasian plate, so the area always relates to the high seismicity zone. The Sumatran subduction zone, the Mentawai fault, and several segments of the Sumatran fault drive seismic activities in the area.
Akmal Firmansyah, Wandono Wandono, Mohamad Ramdhan   +2 more
openaire   +1 more source