The Current Unlikely Earthquake Hiatus at California’s Transform Boundary Paleoseismic Sites

2019 ◽  
Vol 90 (3) ◽  
pp. 1168-1176 ◽  
Author(s):  
Glenn P. Biasi ◽  
Katherine M. Scharer
Keyword(s):  
Transform Boundary

Present-day deformation along the El Pilar Fault in eastern Venezuela: Evidence of creep along a major transform boundary

2011 ◽  
Vol 51 (5) ◽  
pp. 398-410 ◽  
Author(s):  
François Jouanne ◽  
Franck A. Audemard ◽  
Christian Beck ◽  
Aurélien Van Welden ◽  
Reinaldo Ollarves ◽  
...  
Keyword(s):  
Transform Boundary ◽  
El Pilar Fault

scholarly journals Change of geodynamic settings in the Eurasia - Pacific Transition Zone in the late early cretaceous

2019 ◽  
Vol 487 (4) ◽  
pp. 405-408
Author(s):  
A. N. Didenko ◽  
A. I. Khanchuk
Keyword(s):  
Transition Zone ◽  
Early Cretaceous ◽  
Plate Boundary ◽  
Time Range ◽  
Geodynamic Settings ◽  
Eastern Margin ◽  
Transform Boundary

The paper seeks to explain in new ways the change in the geodynamic regime at the eastern margin of the Eurasian paleocontinent in the Early Cretaceous from the convergent type of plate boundary to the transform boundary. Certain global geodynamic characteristics were analyzed in the 200-65 Ma interval, which reflect the processes both at depth and on the Earth’s surface and are seemingly unrelated directly to the formation of the transform boundary in the east of Asia. The change of geodynamic regimes is found to occur within the 115 to 110 million years ago time range.

The Ailao Shan-Red River shear zone (Yunnan, China), Tertiary transform boundary of Indochina

1995 ◽  
Vol 251 (1-4) ◽  
pp. 3-84 ◽  
Author(s):  
Philippe Hervé Leloup ◽  
Robin Lacassin ◽  
Paul Tapponnier ◽  
Urs Schärer ◽  
Dalai Zhong ◽  
...  
Keyword(s):  
Shear Zone ◽  
Red River ◽  
Transform Boundary

scholarly journals Geophysical analysis of the 30 July 1972 Sitka, Alaska, earthquake sequence

Geosphere ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 712-722
Author(s):  
Juan A. Ochoa Chavez ◽  
Diane I. Doser
Keyword(s):  
North American ◽  
Rock Type ◽  
Seismic Hazard Assessment ◽  
Historical Event ◽  
Structural Variations ◽  
The Pacific ◽  
Phase Data ◽  
Near Future ◽  
Transform Boundary ◽  
Alaska Earthquake

Abstract The 1972 Mw 7.6 Sitka earthquake is the largest historical event along the southeastern Alaska portion of the strike-slip Queen Charlotte fault, the transform boundary between the Pacific and North American plates. The fault is one of the fastest moving transform boundaries in the world, having accumulated enough slip since 1972 to produce an event of comparable size in the near future. Thus, understanding the controls on the rupture process of the 1972 mainshock is important for seismic hazard assessment in Alaska. Following the mainshock, the U.S. Geological Survey installed a network of portable seismographs that recorded over 200 aftershocks. These locations were never published, and the original seismograms and digital phase data were misplaced. However, we were able to scan paper copies of the phase data, convert the data to digital form, and successfully relocate 87 aftershocks. The relocations show two clusters of aftershocks along the Queen Charlotte fault, one ∼40 km north of the mainshock epicenter and the other just south of the mainshock, both regions adjacent to portions of the fault that experienced maximum moment release in 1972. Many of the northern aftershocks locate east of the Queen Charlotte fault. This pattern is similar to aftershocks observed in the 2013 Mw = 7.5 Craig, Alaska earthquake. Recent and pre-1971 (1925–1970) seismicity indicates that the regions where aftershocks clustered remained active through time. Gravity, magnetic, and bathymetric anomalies suggest that the structural variations in both the Pacific and North American plates (e.g., age, density, rock type, and thickness) play roles in rupture nucleation and termination along the northern Queen Charlotte fault.

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