scholarly journals Seismic Imaging of the Alaska Subduction Zone: Implications for Slab Geometry and Volcanism

2018 ◽  
Vol 19 (11) ◽  
pp. 4541-4560 ◽  
Author(s):  
Robert Martin‐Short ◽  
Richard Allen ◽  
Ian D. Bastow ◽  
Robert W. Porritt ◽  
Meghan S. Miller
Keyword(s):  
Subduction Zone ◽  
Seismic Imaging ◽  
Slab Geometry

scholarly journals Seismicity and shallow slab geometry in the central Vanuatu subduction zone

2015 ◽  
Vol 120 (8) ◽  
pp. 5606-5623 ◽  
Author(s):  
Christian Baillard ◽  
Wayne C. Crawford ◽  
Valérie Ballu ◽  
Marc Régnier ◽  
Bernard Pelletier ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Slab Geometry

scholarly journals New high-resolution 2D seismic imaging of fluid escape structures in the Makran subduction zone

China Geology ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 1-14
Author(s):  
Bin Liu ◽  
◽  
Jiang-xin Chen ◽  
Syed Waseem Haider ◽  
Xi-guang Deng ◽  
...  
Keyword(s):  
High Resolution ◽  
Subduction Zone ◽  
Seismic Imaging ◽  
Makran Subduction Zone

scholarly journals High-resolution seismic imaging of the western Hellenic subduction zone using teleseismic scattered waves

2009 ◽  
Vol 178 (2) ◽  
pp. 775-791 ◽  
Author(s):  
J. Suckale ◽  
S. Rondenay ◽  
M. Sachpazi ◽  
M. Charalampakis ◽  
A. Hosa ◽  
...  
Keyword(s):  
High Resolution ◽  
Subduction Zone ◽  
Seismic Imaging ◽  
Hellenic Subduction Zone

scholarly journals Seismic imaging of the Cocos plate subduction zone system in central Mexico

2012 ◽  
Vol 13 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
YoungHee Kim ◽  
Meghan S. Miller ◽  
Frederick Pearce ◽  
Robert W. Clayton
Keyword(s):  
Subduction Zone ◽  
Seismic Imaging ◽  
Central Mexico ◽  
Cocos Plate ◽  
Plate Subduction

scholarly journals Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments

2019 ◽  
Vol 218 (3) ◽  
pp. 2122-2135 ◽  
Author(s):  
Gaohua Zhu ◽  
Hongfeng Yang ◽  
Jian Lin ◽  
Zhiyuan Zhou ◽  
Min Xu ◽  
...  
Keyword(s):  
High Resolution ◽  
Subduction Zone ◽  
Matched Filter ◽  
Near Field ◽  
Broad Band ◽  
Velocity Model ◽  
Ocean Bottom ◽  
Slab Geometry ◽  
Seismicity Distribution ◽  
Geodynamic Processes

SUMMARYWe have conducted the first passive Ocean Bottom Seismograph (OBS) experiment near the Challenger Deep at the southernmost Mariana subduction zone by deploying and recovering an array of 6 broad-band OBSs during December 2016–June 2017. The obtained passive-source seismic records provide the first-ever near-field seismic observations in the southernmost Mariana subduction zone. We first correct clock errors of the OBS recordings based on both teleseismic waveforms and ambient noise cross-correlation. We then perform matched filter earthquake detection using 53 template events in the catalogue of the US Geological Survey and find >7000 local earthquakes during the 6-month OBS deployment period. Results of the two independent approaches show that the maximum clock drifting was ∼2 s on one instrument (OBS PA01), while the rest of OBS waveforms had negligible time drifting. After timing correction, we locate the detected earthquakes using a newly refined local velocity model that was derived from a companion active source experiment in the same region. In total, 2004 earthquakes are located with relatively high resolution. Furthermore, we calibrate the magnitudes of the detected earthquakes by measuring the relative amplitudes to their nearest relocated templates on all OBSs and acquire a high-resolution local earthquake catalogue. The magnitudes of earthquakes in our new catalogue range from 1.1 to 5.6. The earthquakes span over the Southwest Mariana rift, the megathrust interface, forearc and outer-rise regions. While most earthquakes are shallow, depths of the slab earthquakes increase from ∼100 to ∼240 km from west to east towards Guam. We also delineate the subducting interface from seismicity distribution and find an increasing trend in dip angles from west to east. The observed along-strike variation in slab dip angles and its downdip extents provide new constraints on geodynamic processes of the southernmost Mariana subduction zone.

Geometric controls on megathrust earthquakes

2020 ◽  
Vol 222 (2) ◽  
pp. 1270-1282
Author(s):  
Steven M Plescia ◽  
Gavin P Hayes
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Earthquake Hazard ◽  
Earthquake Rupture ◽  
Primary Control ◽  
Slab Geometry ◽  
Megathrust Earthquakes ◽  
Maximum Earthquake Magnitude ◽  
Maximum Earthquake

SUMMARY The role of subduction zone geometry in the nucleation and propagation of great-sized earthquake ruptures is an important topic for earthquake hazard, since knowing how big an earthquake can be on a given fault is fundamentally important. Past studies have shown subducting bathymetric features (e.g. ridges, fracture zones, seamount chains) may arrest a propagating rupture. Other studies have correlated the occurrence of great-sized earthquakes with flat megathrusts and homogenous stresses over large distances. It remains unclear, however, how subduction zone geometry and the potential for great-sized earthquakes (M 8+) are quantifiably linked—or indeed whether they can be. Here, we examine the potential role of subduction zone geometry in limiting earthquake rupture by mapping the planarity of seismogenic zones in the Slab2 subduction zone geometry database. We build from the observation that historical great-sized earthquakes have preferentially occurred where the surrounding megathrust is broadly planar, and we use this relationship to search for geometrically similar features elsewhere in subduction zones worldwide. Assuming geometry exerts a primary control on earthquake propagation and termination, we estimate the potential size distribution of large (M 7+) earthquakes and the maximum earthquake magnitude along global subduction faults based on geometrical features alone. Our results suggest that most subduction zones are capable of hosting great-sized earthquakes over much of their area. Many bathymetric features previously identified as barriers are indistinguishable from the surrounding megathrust from the perspective of slab curvature, meaning that they either do not play an important role in arresting earthquake rupture or that their influence on slab geometry at depth is not resolvable at the spatial scale of our subduction zone geometry models.

scholarly journals Seismic imaging of forearc backthrusts at northern Sumatra subduction zone

2009 ◽  
Vol 179 (3) ◽  
pp. 1772-1780 ◽  
Author(s):  
Ajay P. S. Chauhan ◽  
Satish C. Singh ◽  
Nugroho D. Hananto ◽  
Helene Carton ◽  
F. Klingelhoefer ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Seismic Imaging
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