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  Adjoint-state traveltime tomography in Central Java enhanced by a machine-learning-assisted catalog

Bai, Y., Ramdhan, M., Yang, S., Li, T., Chen, J., Nagaso, M., Tong, P. (2023): Adjoint-state traveltime tomography in Central Java enhanced by a machine-learning-assisted catalog, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3791

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020754 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020754_2
Genre: Conference Paper

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 Creators:
Bai, Yiming1, Author
Ramdhan, Mohamad1, Author
Yang, Shun1, Author
Li, Tianjue1, Author
Chen, Jing1, Author
Nagaso, Masaru1, Author
Tong, Ping1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: As one of the most populous regions, Central Java in Indonesia is prone to high seismic and volcanic hazards, primarily due to the progressive northward subduction of the Australian plate beneath the Sunda plate. Detailed velocity structure of the crust and uppermost mantle beneath Central Java is critical for an improved understanding of the subduction processes and the associated seismicity and volcanism. Despite several independent isotropic velocity models proposed for the region, crustal-scale anisotropic structure, which reflects past and ongoing deformation, has rarely been investigated. Our goal is to image the crustal-scale P-wave azimuthally anisotropic structure beneath Central Java. Seismic data used were recorded by > 200 seismic stations from multiple projects. To make full use of the open access data, machine learning phase picking and subsequent event association and location were applied to build a local earthquake catalog. The machine-learning-based workflow detects > 1000 events, roughly triple the amount from previous manual picking. Notably, the preliminary catalog includes a large number of earthquakes that were located in the offshore areas but were recorded by land stations to the north, resulting in huge back azimuthal gaps and potential bias in earthquake relocation. The ongoing study attempts to involve depth phases, such as sPn and sPg, for more accurate earthquake locations and thus more reliable tomographic images. With the expanded and refined seismicity catalog, a ray-free adjoint-state traveltime tomography package called TomoATT will be used for the 3-D velocity heterogeneity and azimuthal anisotropy beneath Central Java.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
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 Identifiers: DOI: 10.57757/IUGG23-3791
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -