Seismic prompt gravity strain signals in a layered spherical EarthKey points
Seismic waves generated by an earthquake can produce dynamic perturbations in the Earth’s gravity field before the direct arrival of P-waves. Observations of these so-called prompt elasto-gravity signals by ground-based gravimeters and broadband seismometers have been reported for some large events,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-10-01
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| Series: | Earthquake Science |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674451923000459 |
| _version_ | 1797660094222041088 |
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| author | Shenjian Zhang Rongjiang Wang Xiaofei Chen |
| author_facet | Shenjian Zhang Rongjiang Wang Xiaofei Chen |
| author_sort | Shenjian Zhang |
| collection | DOAJ |
| description | Seismic waves generated by an earthquake can produce dynamic perturbations in the Earth’s gravity field before the direct arrival of P-waves. Observations of these so-called prompt elasto-gravity signals by ground-based gravimeters and broadband seismometers have been reported for some large events, such as the 2011 MW9.1 Tohoku earthquake. Recent studies have introduced prompt gravity strain signals (PGSSs) as a new type of observable seismic gravity perturbation that can be used to measure the spatial gradient of the perturbed gravity field. Theoretically, these types of signals can be recorded by in-development instruments termed gravity strainmeters, although no successful detection has been reported as yet. Herein, we propose an efficient approach for PGSSs based on a multilayered spherical Earth model. We compared the simulated waveforms with analytical solutions obtained from a homogeneous half-space model, which has been used in earlier studies. This comparison indicates that the effect of the Earth’s structural stratification is significant. With the help of the new simulation approach, we also demonstrated how the PGSSs depend on the magnitude of the seismic source. We further conducted synthetic tests estimating earthquake magnitude using gravity strain signals to demonstrate the potential application of this type of signal in earthquake early warning systems. These results provide essential information for future studies on the synthesis and application of earthquake-induced gravity strain signals. |
| first_indexed | 2024-03-11T18:24:47Z |
| format | Article |
| id | doaj.art-2890d3881fe240b9a97ab01a1a2c99b3 |
| institution | Directory Open Access Journal |
| issn | 1867-8777 |
| language | English |
| last_indexed | 2024-03-11T18:24:47Z |
| publishDate | 2023-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Earthquake Science |
| spelling | doaj.art-2890d3881fe240b9a97ab01a1a2c99b32023-10-14T04:44:24ZengKeAi Communications Co., Ltd.Earthquake Science1867-87772023-10-01365341355Seismic prompt gravity strain signals in a layered spherical EarthKey pointsShenjian Zhang0Rongjiang Wang1Xiaofei Chen2Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, ChinaHelmholtz Center Potsdam, GFZ German Research Center for Geosciences, D-14473 Potsdam, GermanyDepartment of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China; Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology, Southern University of Science and Technology, Shenzhen 518055, China; Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology, Southern University of Science and Technology, Shenzhen 518055, China; Corresponding author: Chen XF,Seismic waves generated by an earthquake can produce dynamic perturbations in the Earth’s gravity field before the direct arrival of P-waves. Observations of these so-called prompt elasto-gravity signals by ground-based gravimeters and broadband seismometers have been reported for some large events, such as the 2011 MW9.1 Tohoku earthquake. Recent studies have introduced prompt gravity strain signals (PGSSs) as a new type of observable seismic gravity perturbation that can be used to measure the spatial gradient of the perturbed gravity field. Theoretically, these types of signals can be recorded by in-development instruments termed gravity strainmeters, although no successful detection has been reported as yet. Herein, we propose an efficient approach for PGSSs based on a multilayered spherical Earth model. We compared the simulated waveforms with analytical solutions obtained from a homogeneous half-space model, which has been used in earlier studies. This comparison indicates that the effect of the Earth’s structural stratification is significant. With the help of the new simulation approach, we also demonstrated how the PGSSs depend on the magnitude of the seismic source. We further conducted synthetic tests estimating earthquake magnitude using gravity strain signals to demonstrate the potential application of this type of signal in earthquake early warning systems. These results provide essential information for future studies on the synthesis and application of earthquake-induced gravity strain signals.http://www.sciencedirect.com/science/article/pii/S1674451923000459gravity strainsynthetic seismogramearthquake early warning system |
| spellingShingle | Shenjian Zhang Rongjiang Wang Xiaofei Chen Seismic prompt gravity strain signals in a layered spherical EarthKey points Earthquake Science gravity strain synthetic seismogram earthquake early warning system |
| title | Seismic prompt gravity strain signals in a layered spherical EarthKey points |
| title_full | Seismic prompt gravity strain signals in a layered spherical EarthKey points |
| title_fullStr | Seismic prompt gravity strain signals in a layered spherical EarthKey points |
| title_full_unstemmed | Seismic prompt gravity strain signals in a layered spherical EarthKey points |
| title_short | Seismic prompt gravity strain signals in a layered spherical EarthKey points |
| title_sort | seismic prompt gravity strain signals in a layered spherical earthkey points |
| topic | gravity strain synthetic seismogram earthquake early warning system |
| url | http://www.sciencedirect.com/science/article/pii/S1674451923000459 |
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