GSTDTAP

浏览/检索结果: 共7条,第1-7条 帮助

已选(0)清除 条数/页:   排序方式:
研究揭示断层粗糙度与地震震级之间的关系 快报文章
地球科学快报,2020年第9期
作者:  赵纪东
Microsoft Word(13Kb)  |  收藏  |  浏览/下载:354/0  |  提交时间:2020/05/09
earthquake  fault roughness  earthquake magnitude  
Months-long thousand-kilometre-scale wobbling before great subduction earthquakes 期刊论文
NATURE, 2020, 580 (7805) : 628-+
作者:  Son, Hyungmok;  Park, Juliana J.;  Ketterle, Wolfgang;  Jamison, Alan O.
收藏  |  浏览/下载:31/0  |  提交时间:2020/05/13

Observed reversals in GNSS surface motions suggests greatly enhanced slab pull in the months preceding the great subduction earthquakes in Maule (Chile, 2010) and Tohoku-oki (Japan, 2011) of moment magnitudes 8.8 and 9.0.


Megathrust earthquakes are responsible for some of the most devastating natural disasters(1). To better understand the physical mechanisms of earthquake generation, subduction zones worldwide are continuously monitored with geophysical instrumentation. One key strategy is to install stations that record signals from Global Navigation Satellite Systems(2,3) (GNSS), enabling us to track the non-steady surface motion of the subducting and overriding plates before, during and after the largest events(4-6). Here we use a recently developed trajectory modelling approach(7) that is designed to isolate secular tectonic motions from the daily GNSS time series to show that the 2010 Maule, Chile (moment magnitude 8.8) and 2011 Tohoku-oki, Japan (moment magnitude 9.0) earthquakes were preceded by reversals of 4-8 millimetres in surface displacement that lasted several months and spanned thousands of kilometres. Modelling of the surface displacement reversal that occurred before the Tohoku-oki earthquake suggests an initial slow slip followed by a sudden pulldown of the Philippine Sea slab so rapid that it caused a viscoelastic rebound across the whole of Japan. Therefore, to understand better when large earthquakes are imminent, we must consider not only the evolution of plate interface frictional processes but also the dynamic boundary conditions from deeper subduction processes, such as sudden densification of metastable slab.


  
Earthquake Catalog-Based Machine Learning Identification of Laboratory Fault States and the Effects of Magnitude of Completeness 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (24) : 13269-13276
作者:  Lubbers, Nicholas;  Bolton, David C.;  Mohd-Yusof, Jamaludin;  Marone, Chris;  Barros, Kipton;  Johnson, Paul A.
收藏  |  浏览/下载:20/0  |  提交时间:2019/04/09
machine learning  laboratory earthquakes  earthquake catalogs  earthquake forecasting  magnitude of completeness  
How Fast Can We Reliably Estimate the Magnitude of Subduction Earthquakes? 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (18) : 9633-9641
作者:  Leyton, F.;  Ruiz, S.;  Baez, J. C.;  Meneses, G.;  Madariaga, R.
收藏  |  浏览/下载:13/0  |  提交时间:2019/04/09
fast magnitude estimation  earthquake early warning  subduction earthquakes  
Real-Time Magnitude Characterization of Large Earthquakes Using the Predominant Period Derived From 1 Hz GPS Data 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (2) : 517-526
作者:  Psimoulis, Panos A.;  Houlie, Nicolas;  Behr, Yannik
收藏  |  浏览/下载:4/0  |  提交时间:2019/04/09
Hz GPS  earthquake magnitude  predominant period  smoothing factor  
Rapid determination of P wave-based energy magnitude: Insights on source parameter scaling of the 2016 Central Italy earthquake sequence 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (9)
作者:  Picozzi, Matteo;  Bindi, Dino;  Brondi, Piero;  Di Giacomo, Domenico;  Parolai, Stefano;  Zollo, Aldo
收藏  |  浏览/下载:7/0  |  提交时间:2019/04/09
energy magnitude  real-time seismology  seismic source parameters  2016 Central Italy earthquakes  earthquake early warning  local magnitude  
Alternatives Analysis Amchitka Island Mud Pit Cap Repair, Amchitka, Alaska January 2016 科技报告
来源:US Department of Energy (DOE). 出版年: 2016
作者:  Darr, Paul S.
收藏  |  浏览/下载:4/0  |  提交时间:2019/04/05
Mud pit caps were damaged during a 7.9-magnitude earthquake that occurred in 2014