scholarly journals Variations in lithospheric anisotropy across the North Anatolian Fault revealed by teleseismic shear wave splitting

2021 ◽  
Author(s):  
David Cornwell ◽  
Sebastian Rost ◽  
David A Thompson ◽  
Gregory A. Houseman ◽  
Lisa A Millar ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
North Anatolian Fault ◽  
The North ◽  
Wave Splitting

scholarly journals Shear wave splitting along a nascent plate boundary: the North Anatolian Fault Zone

2010 ◽  
Author(s):  
C. Berk Biryol ◽  
George Zandt ◽  
Susan L. Beck ◽  
A. Arda Ozacar ◽  
Hande E. Adiyaman ◽  
...  
Keyword(s):  
Shear Wave ◽  
Fault Zone ◽  
Plate Boundary ◽  
Shear Wave Splitting ◽  
North Anatolian Fault ◽  
North Anatolian Fault Zone ◽  
The North ◽  
Wave Splitting

scholarly journals Automatic Shear Wave Splitting Measurements at Mt. Ruapehu Volcano, New Zealand

2021 ◽  
Author(s):  
◽  
Andreas Wessel
Keyword(s):  
New Zealand ◽  
Shear Wave ◽  
Automatic Measurement ◽  
Automatic Monitoring ◽  
Shear Wave Splitting ◽  
Measurement Tool ◽  
Data Set ◽  
The North ◽  
Wave Splitting ◽  
Ruapehu Volcano

<p>This thesis presents an automatic shear wave splitting measurement tool and the results from its application to data recorded in the vicinity of Mt. Ruapehu volcano on the North Island of New Zealand. The best methodology and parameters for routine automatic monitoring are determined and approximately 10,000 events are processed. About 50% of all S-phases lead to measurements of acceptable quality. Results obtained with this technique are reproducible and objective, but more scattered than results from manual measurements. The newly developed automatic measurement tool is used to measure shear wave splitting for previously analysed data and for new data recorded in 2003-2007. In contrast to previous studies at Mt. Ruapehu, we have a larger and continuous data set from numerous three-component seismic stations. No major temporal changes are found within the new data, but results vary for di erent station locations. I</p>

scholarly journals Automatic Shear Wave Splitting Measurements at Mt. Ruapehu Volcano, New Zealand

2021 ◽  
Author(s):  
◽  
Andreas Wessel
Keyword(s):  
New Zealand ◽  
Shear Wave ◽  
Automatic Measurement ◽  
Automatic Monitoring ◽  
Shear Wave Splitting ◽  
Measurement Tool ◽  
Data Set ◽  
The North ◽  
Wave Splitting ◽  
Ruapehu Volcano

<p>This thesis presents an automatic shear wave splitting measurement tool and the results from its application to data recorded in the vicinity of Mt. Ruapehu volcano on the North Island of New Zealand. The best methodology and parameters for routine automatic monitoring are determined and approximately 10,000 events are processed. About 50% of all S-phases lead to measurements of acceptable quality. Results obtained with this technique are reproducible and objective, but more scattered than results from manual measurements. The newly developed automatic measurement tool is used to measure shear wave splitting for previously analysed data and for new data recorded in 2003-2007. In contrast to previous studies at Mt. Ruapehu, we have a larger and continuous data set from numerous three-component seismic stations. No major temporal changes are found within the new data, but results vary for di erent station locations. I</p>

scholarly journals The Development of Seismic Anisotropy Below South-Central Alaska: Evidence from Local Earthquake Shear-Wave Splitting

2020 ◽  
Author(s):  
E Karlowska ◽  
I D Bastow1 ◽  
S Rondenay2 ◽  
R Martin-Short3 ◽  
R M Allen3
Keyword(s):  
Subduction Zone ◽  
Shear Wave ◽  
Mantle Wedge ◽  
Seismic Anisotropy ◽  
Shear Wave Splitting ◽  
Mantle Flow ◽  
The North ◽  
South Central ◽  
Wave Splitting ◽  
Local Earthquake

Summary The Transportable Array in south-central Alaska spans several subduction zone features: backarc, forearc and volcanic arc, making it an ideal tool to study subduction zone anisotropy. Shear-wave splitting analysis of 157 local earthquakes of mb≥3.0 that occurred between 2014 and 2019 yields 210 high quality measurements at 23 stations. Splitting delay times (δt) are generally small (δt≈0.3 s), increasing with distance from the trench. Arc parallel fast directions, φ, are only seen in the forearc, but rotate to arc perpendicular φ in the backarc. Observed φ values generally do not parallel teleseismic SKS splitting results, implying the latter is sensitive primarily to sub-slab mantle flow, not mantle wedge dynamics. The forearc local-earthquake signal likely originates from anisotropic serpentinite in fractures atop the subducting Pacific plate, with possible additional signal coming from fractures in the North American crust. Mantle wedge corner flow, potentially with additional arc-perpendicular anisotropy in the subducting slab, explains backarc anisotropy.

Sign in / Sign up

Export Citation Format

Share Document