Attenuation characteristics of coda wave in southern Arabian Shield

Qaysi, Saleh; Abdelfattah, Ali K.; Almadani, Sattam; Olaniyan, Abdulrasheed; Alzahrani, Hassan

doi:10.1016/j.jksus.2022.102372

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…So that, the heterogeneity or irregularities can be estimated from the quality factor measurement. When a seismic wave travels through a high-Q region, the amplitude will attenuate less than that of the region [4,5]. For the tectonically active region, Q0 (Q at reference frequency at 1 Hz) is estimated to < 200, while tectonically stable region Q0 is estimated to be > 600.…”

Section: Introductionmentioning

confidence: 99%

Attenuation characteristics of coda wave in Northern Aceh, Sumatra, Indonesia

Anggono,

Syuhada,

Pranata

et al. 2024

J. Phys.: Conf. Ser.

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Sumatra Island is located in the subduction zone between Indo-Australian and Eurasian Plates. The tectonic activity has resulted in an active region. Hence, it may cause more heterogeneous crust in the region. To understand the relationship between the attenuation factor and the tectonic setting, we apply coda wave attenuation study Sumatra Island. This preliminary result focuses at the northern Aceh from observation at LHMI station. A total of about 123 earthquake waveforms of local distance (less than 3°) with depth less than 40 km is analyzed in this study. We employ a back-scattering model assumption to determine the attenuation of coda waves. Our coda wave quality factor (Qc ) estimation covers frequencies from 1 to 8 Hz. Onset of the coda window is determined by considering twice the arrival time of shear wave, with varying window lengths between 20 and 120 s. The Q0 (Qc at frequency 1 Hz) varies from 65.84 ± 5.50 to 183.09 ± 7.17. We observe a decrease in the factor of frequency dependence (η) between 1.14 ± 0.06 and 1.04 ± 0.03. Depth dependent of coda wave attenuation can be seen from the increase of Q0 (which is Qc at 1 Hz) with window length. We suggest that the Low Q0 (< 200) and high η (> 1) may be associated with high tectonic activity in this region.

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Section: Introductionmentioning

confidence: 99%

Attenuation characteristics of coda wave in Northern Aceh, Sumatra, Indonesia

Anggono,

Syuhada,

Pranata

et al. 2024

J. Phys.: Conf. Ser.

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“…For shear wave, it is estimated that η ranges about 0.0 -1.0 and varies globally. Recent studies have applied coda wave attenuation to investigate the attenuation characteristics for different tectonic settings [6][7][8][9][10]. station (white triangle).…”

Section: Introductionmentioning

confidence: 99%

Coda wave attenuation in Northern Aceh, Indonesia from a single station measurement: preliminary results

Anggono,

Syuhada,

Pranata

et al. 2023

J. Phys.: Conf. Ser.

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Sumatra-Andaman subduction zone is one of the most active tectonic areas in the world. Understanding seismic risk in this region is important for hazard mitigation. One of the crustal physical properties is attenuation. Attenuation structure may affect the seismic propagation through the medium. It expresses the seismic wave amplitude decay when wave propagates through a medium. In this preliminary result, we report the seismic attenuation characteristics in Northern Aceh, Indonesia. We estimate coda waves attenuation from a single station from GE network. using a single back-scattering model. We analyze about 123 waveforms from local earthquakes (less than 3°) with magnitudes between 3 and 6 using a single back-scattering model. The depth of the events is selected to be shallower than 40 km depth. We estimate coda quality factor (Qc ) for each event at frequencies 1 – 8 Hz. The coda window is estimated from two times of S-wave arrival time with different window length ranging from 20 to 80 s. Reference coda quality factor (Q0 ) is selected at frequency of 1 Hz. We obtain that Q0 varies from 74.34 ± 10.04 to 160.2 ± 5.96 at 20 s and 80 s window lengths, respectively. The frequency dependence factor (η) decreases from 1.12 ± 0.06 to 1.05 ± 0.03 at 20 s and 80 s window length, respectively. An increase of Q0 with window length may suggest the depth dependent of seismic wave attenuation at reference frequency of 1 Hz. Low Q0 and high η are also consistent with this region’s high tectonic activity.

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