Small-scale scattering heterogeneities beneath the northern Tien Shan from the teleseismic P wavefield

Ma, Xiaolong; Huang, Zhipei

doi:10.1186/s40623-020-1136-1

Cited by 2 publications

(2 citation statements)

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“…For the first process, we collect 7 Mw > 7.0 events from WebDC3 GFZ [13] (Fig. 1B) with epicentre to station distance between 50-80 degrees to obtain nearly vertical incident of P wave propagating into the lithosphere, to ensure that the coda does not contain any other deterministic body wave phases 25 s after P arrival, the depth is constrained to be greater than 110 [14]. The sampling rate is uniform in all of the data (40 Hz), but the recording instrument varies.…”

Section: Methodsmentioning

confidence: 99%

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Preliminary result for crustal properties derivation related to tectonics for hazard mitigation in Eastern Indonesia using Teleseismic P Coda

et al. 2021

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Eastern Indonesia is tectonically complex, formed by different plates and microplates interactions from different origins. This complexity gives geoscientists a challenge to solve the ’jigsaw’ of the complex interactions. The understanding of tectonic processes can lead to a breakthrough in both resource exploration and disaster risk reduction. We utilize teleseismic P wave coda for random coda from scattering and deterministic coda originated from the crust-mantle boundary (Moho) to derive the crustal properties, including thickness, Vp/Vs, and qualitative scattering characteristics. For the scattering properties, we apply Iterative Cross-Correlation and Stacking (ICCS) to align the waveform. At the same time, for the crust characteristic, we employ the Receiver Functions (RF) method alongside H-k stacking. The crustal thickness recovered from the RF and H-k stacking has a good correlation with the crustal origin, where the thickness in older and stable crust originated from Sundaland and Gondwana is thicker than a younger plate of the crust arc and subduction origin. The Vp/Vs is high in a region that is interpreted to be dominated by mafic lower crust originated from oceanic-oceanic subduction during Eocene, anisotropy, or by a magmatic anomaly. The P coda also correlated well with the subsurface magmatic anomaly by providing a unique pattern.

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Section: Methodsmentioning

confidence: 99%

“…Before the alignment process, the instrument response is removed to get the true ground motion using Obspy [15]. The corrected data then normalized to each maximum value, and 0.1-8.0 Hz bandpass filtered [14]. We apply the Iterative Cross-correlation and Stacking (ICCS) algorithm [16] to remove the time delay between the station recording.…”

Section: Methodsmentioning

confidence: 99%