Spatial variations of seismic attenuation in the North West of Iranian plateau from analysis of coda waves

Naghavi, Mojtaba; Rahimi, Habib; Moradi, Ali; Mukhopadhyay, S.

doi:10.1016/j.tecto.2017.04.026

Cited by 15 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the 20 to 40 s time windows, the Q o values are increasing from 46 to 74 and the n values are also rising from 0.97 to 1.06. Naghavi et al [2017] obtained high attenuation for the region with thermal springs and volcanic structure in North West of Iranian plateau. Canas et al [1995] found low Q o values near the Canary Islands that have high magmatic activity.…”

Section: Resultsmentioning

confidence: 90%

Determination of Coda Wave Attenuation Characteristic of the Armutlu Peninsula and Its Surroundings (Middle Marmara Region, Turkey).

Yavuz

Barış²

2019

Annals of Geophysics

View full text Add to dashboard Cite

The Armutlu Peninsula, is located in a geologically complex system on the North Anatolian Fault Zone and inside the high populated Marmara Region. Due to its location and importance, the Marmara Region has been subject to various studies in the past; now, this study is aimed to determine the local attenuation characteristic of the Armutlu Peninsula. In this study, 75 earthquake data that were recorded between 2013-2014, were analyzed by 9 seismic stations. The magnitudes (Ml) and the focal depths of the earthquakes vary from 1.5 to 3.3 and 0.9 to 16.9 km, respectively. A single back-scattering model was used for calculation of the coda wave quality factor. The lapse times were determined between 20 and 40 s at intervals of 5 s and they were filtered at central frequencies of 1.5, 3, 6, 9 and 12 Hz band-pass designed filter. Minimum 5 signal/noise ratio and 0.7 correlation coefficient data used to obtain reliable results. The CODAQ subroutine integrated in the SEISAN software was used for data processing. For each station, low values of the quality factor at 1 Hz (Q o ) and high values of the frequency dependent parameter (n) were determined. In the Armutlu Peninsula and its surroundings, Q c =51f 0.91 for 20 s and Q c =112f 0.72 for 40 s window lengths were calculated by using 9 stations. There is a tendency between increasing Q o and decreasing n parameters. Otherwise, for station TRML, located near the geothermal hotspot, these parameters are in direct proportion with each other, as Q c =46f 0.97 for 20 s and Q c =74f 1.06 for 40 s window lengths. These parameter changes are directly connected with the geothermal activity. the rate of coda wave attenuation [Aki, 1969]. Local/regional recorded coda waves (up to 100 km epicentral distance) and their power spectra as well as coda duration are relatively independent from the focal distance [Aki and Chouet, 1975]. Q c determination studies are generally performed in tectonically active fields, active volcanic regions, earthquake swarm areas, magmatic flows and geothermal areas [

show abstract

Section: Resultsmentioning

confidence: 90%

Determination of Coda Wave Attenuation Characteristic of the Armutlu Peninsula and Its Surroundings (Middle Marmara Region, Turkey).

Yavuz

Barış²

2019

Annals of Geophysics

View full text Add to dashboard Cite

show abstract

“…On the other side, when the onset of coda windows is increased, the value of c Q can also be affected and brings some artifact to the final results (Kvamme 1985;Lee et al 1986). Consequently, to find out an appropriate range of epicentral distance and lapse time, we estimated the c Q in a length of a fixed window of 30 s and different coda onset (2ts, 50ts and 80ts , where ts is the travel time of shear wave in the crusts) after the origin time of the events (Naghavi et al 2017). All estimations of c Q for these three scenarios are shown in (Fig.…”

Section: Measurements and Data Evaluationmentioning

confidence: 99%

“…The coda wave attenuation can also provide some information about the medium heterogeneites and seismicity of a region (Soham and Abhishek 2016). Study of the seismic wave attenuation is also needed for seismic risk analysis in order to better understanding of source processes in an active tectonic zone (Singh and Herrmann 1983;Jin and Aki 1988;Rahimi et al 2008;Mukhopadhyay et al 2016;Rahimi et al 2010;Singh et al 2015;Kumar et al 2016;Naghavi et al 2017). The total attenuation of seismic waves is determine as the inverse of quality factor ( 1…”

Section: Introductionmentioning

confidence: 99%

Coda wave attenuation in the Zagros collision zone in southwest of Iran and its tectonic implications

Talebi,

Rahimi,

Moradi

2024

Preprint

View full text Add to dashboard Cite

The Zagros collision zone, located in the southwest of Iran, is experiencing to an immoderately large number of seismic hazards caused by the convergence between the two Arabia and micro-plate of central Iran. The coda Q have been widely used as a vital parameter to investigate the different tectonic features as well as seismic risk assessments. In this study, we have analyzed the spatial variation of coda wave attenuation in the Zagros region, to evaluate the different geological features affecting the seismic wave’s propagation. Our dataset comprises 87295 coda records of about 6421 local earthquakes, with magnitude greater than three recorded by 36 seismic stations in the period of 2006 to 2020. we have applied a very simple regionalization method to mapping spatial distribution of in Zagros area. The spatial distributions of coda Q have a positive correlation with the tectonically and lithology of the interested area. According to the results, three primary elements have been suggested as major controlling factors of variation of seismic Coda waves in different parts of the Zagros area. These factors include: 1) intra-crustal relamination process (crustal channeling), 2) 12 km thickness of sediment-filled by fluid (oil and gas) and 3) Hormoz salt (salt domes). Our results also revealed that the suture zone of Zagros (the Main Zagros Thrust fault, MZT) can be considered as a border in which the distribution of coda wave is different on the sides of the fault.

show abstract

“…Based on the results of Hamzehloo et al [2012] [Alavi and Kishvar, 1991;Hessami et al, 2003;Hamzehloo et al, 2012;Fard et al, 2015;Kaviani et al, 2015]. Coda wave attenuation has been estimated at many regions of Iran using different dataset and methods [Ma'hood et al, 2009;Rahimi et al, 2010;Farrokhi et al, 2015;Irandoust et al, 2016;Naghavi et al, 2017;Amiri Fard et al, 2019;Ahmadzadeh et al, 2017Ahmadzadeh et al, & 2019.…”

Section: Introductionmentioning

confidence: 99%

Coda wave attenuation's dependency on Lapse time and frequency in west of Iran plateau using local earthquakes

Fard¹,

Doloei

Farrokhi³

et al. 2020

Annals of Geophysics

View full text Add to dashboard Cite

show abstract

Spatial variations of seismic attenuation in the North West of Iranian plateau from analysis of coda waves

Cited by 15 publications

References 42 publications

Determination of Coda Wave Attenuation Characteristic of the Armutlu Peninsula and Its Surroundings (Middle Marmara Region, Turkey).

Determination of Coda Wave Attenuation Characteristic of the Armutlu Peninsula and Its Surroundings (Middle Marmara Region, Turkey).

Coda wave attenuation in the Zagros collision zone in southwest of Iran and its tectonic implications

Coda wave attenuation's dependency on Lapse time and frequency in west of Iran plateau using local earthquakes

Contact Info

Product

Resources

About