open access

https://hdl.handle.net/2115/98110

Station-Orientation Catalog for Australian Broadband Seismic Stations

英語

receiver function

2025-09-16

Springer

Pure and applied geophysics

Many broadband seismic stations deployed permanently and temporarily in the Australian continent have been used for various seismological investigations in and around Australia. Although two horizontal components are generally assumed to be oriented in the north and east directions, as reported by data providers, misorientations of horizontal components from the true geographic north direction cannot be avoided in practical field observations, even at well-maintained permanent stations. In this paper, we applied a polarization analysis to almost all stations in Australia to estimate the misorientations of horizontal components using long-period teleseismic P-waves. A large data set of P-wave arrival angles allows us to successfully detect probable horizontal misorientations, including significant temporal changes in some stations, which generally coincide with reported equipment replacements included in the EarthScope (IRIS) catalog. However, we also detected some unreported temporal changes in station orientation that may result from undocumented maintenance activities, such as sensor reorientation, which are typically not reflected in metadata. Improper corrections for orientation may affect waveform-based studies for the Earth's internal exploration, as demonstrated by teleseismic receiver function analyses, especially in the transverse component. Compiling the information on such time-dependent misorientations, we created a full catalog of horizontal-component orientations for both permanent and temporary stations in Australia, which is widely available for the community.

学術雑誌論文

Accepted Manuscript

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s00024-025-03827-7

0033-4553