Wave Equation‐Based Local Traveltime Inversion

Hu, Yong; Han, Liguo; Liu, Y. S.; Jin, Zhongyuan

doi:10.1029/2020ea001193

Cited by 4 publications

(2 citation statements)

References 54 publications

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“…Trialing other misfit functions that capture traveltime differences of multiple events, such as the local traveltime inversion method proposed by Hu et al. (2020) could also be advantageous. Another promising branch of research is uncertainty quantification for FWT in the CZ, as these methods may help researchers to identify and avoid interpreting inversion artifacts (e.g., Thurin et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Looking into measurements that limit errors associated with source estimation and instrument response while simultaneously increasing Earth and Space Science 10.1029/2023EA003248 resolution, such as the double difference measurement (e.g., Yuan et al, 2016) would be worthwhile. Trialing other misfit functions that capture traveltime differences of multiple events, such as the local traveltime inversion method proposed by Hu et al (2020) could also be advantageous. Another promising branch of research is uncertainty quantification for FWT in the CZ, as these methods may help researchers to identify and avoid interpreting inversion artifacts (e.g., Thurin et al, 2019).…”

Section: Limitations Uncertainties and Outlook On Future Workmentioning

confidence: 99%

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2D Near‐Surface Full‐Waveform Tomography Reveals Bedrock Controls on Critical Zone Architecture

Eppinger,

Holbrook,

Liu

et al. 2024

Earth and Space Science

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For decades, seismic imaging methods have been used to study the critical zone, Earth's thin, life‐supporting skin. The vast majority of critical zone seismic studies use traveltime tomography, which poorly resolves heterogeneity at many scales relevant to near‐surface processes, therefore limiting progress in critical zone science. Full‐waveform tomography can overcome this limitation by leveraging more seismic data and enhancing the resolution of geophysical imaging. In this study, we apply 2D full‐waveform tomography to match the phases of observed seismograms and elucidate previously undetected heterogeneity in the critical zone at a well‐studied catchment in the Laramie Range, Wyoming. In contrast to traveltime tomograms from the same data set, our results show variations in depth to bedrock ranging from 5 to 60 m over lateral scales of just tens of meters and image steep low‐velocity anomalies suggesting hydrologic pathways into the deep critical zone. Our results also show that areas with thick fractured bedrock layers correspond to zones of slightly lower velocities in the deep bedrock, while zones of high bedrock velocity correspond to sharp vertical transitions from bedrock to saprolite. By corroborating these findings with borehole imagery, we hypothesize that lateral changes in bedrock fracture density majorly impact critical zone architecture. Borehole data also show that our full‐waveform tomography results agree significantly better with velocity logs than previously published traveltime tomography models. Full‐waveform tomography thus appears unprecedentedly capable of imaging the spatially complex porosity structure crucial to critical zone hydrology and processes.

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Section: Discussionmentioning

confidence: 99%