Spatial variations of coda wave attenuation in Andaman–Nicobar subduction zone

2019 ◽  
Vol 217 (3) ◽  
pp. 1515-1523 ◽  
Author(s):  
Chandrani Singh ◽  
Rahul Biswas ◽  
Namrata Jaiswal ◽  
M Ravi Kumar
Keyword(s):  
Subduction Zone ◽  
Wave Attenuation ◽  
Spatial Variations ◽  
Coda Wave ◽  
Coda Wave Attenuation

Spatial variations of coda wave attenuation in Andaman-Nicobar subduction zone

2020 ◽  
Author(s):  
Chandrani Singh ◽  
Rahul Biswas ◽  
Namrata Jaiswal ◽  
M. Ravi Kumar
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Velocity Structure ◽  
Wave Attenuation ◽  
Broad Band ◽  
Spatial Variations ◽  
Indian Plate ◽  
Coda Wave ◽  
Volcanic Island ◽  
Attenuation Characteristics

<p>We investigate the spatial variations of coda attenuation (Qc) structure in the tectonically complex Andaman–Nicobar subduction zone (ANSZ), which is one of the most seismically active subduction zones on the Earth. The region constitutes the northernmost part of the Sunda subduction zone, where the Indian plate disappears beneath the Burmese plate along the Burma and Andaman arcs to the east. This is probably the first attempt to map the Qc variations across the whole ANSZ. In a seismically active area, the spatial distribution of Qc is important to evaluate the seismic hazard in relation to tectonics and seismicity.</p><p>A total of 289 high-quality events recorded at a network of broad-band stations operational since 2009 are considered for the analysis. The variations in attenuation characteristics at different frequencies reveal a marked contrast from the northern to the southern Andaman region, consistent with the geotectonic diversity of the region. At low frequencies, low Qc values are observed in the northern part of ANSZ in the vicinity of the Narcondum volcanic island, which does not appear in the high-frequency image. The low values are in agreement with the 3-D tomogram, which suggests a distinct low-velocity structure below this volcanic island. The Andaman trench also exhibits a relatively low Qc, which is well correlated with the low-Vp zone. The spatial distributions of Q0 (Qc at 1 Hz) structure of the region are further projected onto three east–west profiles to capture the detailed attenuation characteristics from north to south. Results show that the northernmost part of ANSZ is more attenuative than the southern part, which may be indicative of the changes in physical properties of the crust. The frequency relation parameter (n) shows an inverse correlation with the observed Q0 values. Furthermore, we have observed a good correlation between the Q0 variation and the seismicity pattern of the area that enables us to enhance our understanding about the role of crustal heterogeneity in the earthquake occurrence in this area.</p><p><br><br></p>

Coda Wave Attenuation For Center North Of Parecis Basin In The Amazon Craton – Brazil

2009 ◽  
Author(s):  
Lucas Vieira Barros ◽  
Marcelo Assumpção ◽  
Ronnie Quinteiro ◽  
Vinicius Ferreira
Keyword(s):  
Wave Attenuation ◽  
Coda Wave ◽  
Coda Wave Attenuation

Characteristics of coda wave attenuation in Yunnan area

2006 ◽  
Vol 19 (1) ◽  
pp. 8-19
Author(s):  
Wei-jun Wang ◽  
Jie Liu ◽  
Ling Chen
Keyword(s):  
Wave Attenuation ◽  
Coda Wave ◽  
Yunnan Area ◽  
Coda Wave Attenuation

scholarly journals Coda Wave Attenuation Characteristics for North Anatolian Fault Zone, Turkey

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Fadime Sertcelik ◽  
Mehmet Guleroglu
Keyword(s):  
Fault Zone ◽  
Wave Attenuation ◽  
Active Faults ◽  
North Anatolian Fault ◽  
Coda Wave ◽  
North Anatolian Fault Zone ◽  
The Past ◽  
Coda Wave Attenuation ◽  
Large Earthquakes ◽  
Attenuation Characteristics

AbstractNorth Anatolian Fault Zone, on which large earthquakes have occurred in the past, migrates regularly from east to west, and it is one of the most active faults in the world. The purpose of this study is to estimate the coda wave quality factor (

Estimation of Coda Wave Attenuation for the National Capital Region, Delhi, India Using Local Earthquakes

2009 ◽  
Vol 166 (3) ◽  
pp. 429-449 ◽  
Author(s):  
William K. Mohanty ◽  
Rajesh Prakash ◽  
G. Suresh ◽  
A. K. Shukla ◽  
M. Yanger Walling ◽  
...  
Keyword(s):  
Wave Attenuation ◽  
Coda Wave ◽  
National Capital Region ◽  
Capital Region ◽  
Local Earthquakes ◽  
National Capital ◽  
Coda Wave Attenuation
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