Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips
Abstract The water in Earth’s mantle is closely related with plate subduction and volcanism. Recent studies revealed that the mantle wedge corner at approximately 30 km depth holds high-pressure water, where many slow earthquakes occur. To quantify how such water behaves during slow earthquakes help...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-02-01
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| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40623-018-0797-5 |
| _version_ | 1828364944513433600 |
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| author | Yoshiyuki Tanaka Takehito Suzuki Yuichi Imanishi Shuhei Okubo Xinlin Zhang Miwako Ando Atsushi Watanabe Mamoru Saka Chiaki Kato Shuichi Oomori Yoshifumi Hiraoka |
| author_facet | Yoshiyuki Tanaka Takehito Suzuki Yuichi Imanishi Shuhei Okubo Xinlin Zhang Miwako Ando Atsushi Watanabe Mamoru Saka Chiaki Kato Shuichi Oomori Yoshifumi Hiraoka |
| author_sort | Yoshiyuki Tanaka |
| collection | DOAJ |
| description | Abstract The water in Earth’s mantle is closely related with plate subduction and volcanism. Recent studies revealed that the mantle wedge corner at approximately 30 km depth holds high-pressure water, where many slow earthquakes occur. To quantify how such water behaves during slow earthquakes helps us understand the mechanisms of these earthquakes and (eventually) a part of the long-term water cycle between the interior and surface of the Earth. However, little evidence has thus far been reported on the transient flows of such deep water. Here, we report anomalous, negative mass anomalies during two recent long-term slow slip events in the Tokai area in Japan, which were detected by absolute gravity measurements over 20 years. We present a poroelastic fluid flow model assuming a localized deformation within the fault fracture zone. The model can reproduce the gravity change with a permeability range between those suggested by laboratory experiments and numerical simulations of slow earthquakes. |
| first_indexed | 2024-04-14T05:22:50Z |
| format | Article |
| id | doaj.art-c8aeda12c71e495a8cf4f5978d79d35a |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-04-14T05:22:50Z |
| publishDate | 2018-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-c8aeda12c71e495a8cf4f5978d79d35a2022-12-22T02:10:06ZengSpringerOpenEarth, Planets and Space1880-59812018-02-017011810.1186/s40623-018-0797-5Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slipsYoshiyuki Tanaka0Takehito Suzuki1Yuichi Imanishi2Shuhei Okubo3Xinlin Zhang4Miwako Ando5Atsushi Watanabe6Mamoru Saka7Chiaki Kato8Shuichi Oomori9Yoshifumi Hiraoka10Earthquake Research Institute, The University of TokyoDepartment of Physics and Mathematics, Aoyama Gakuin UniversityEarthquake Research Institute, The University of TokyoEarthquake Research Institute, The University of TokyoInstitute of Seismology, Earthquake Administration ChinaEarthquake Research Institute, The University of TokyoEarthquake Research Institute, The University of TokyoEarthquake Research Institute, The University of TokyoGeospatial Information Authority of JapanGeospatial Information Authority of JapanGeospatial Information Authority of JapanAbstract The water in Earth’s mantle is closely related with plate subduction and volcanism. Recent studies revealed that the mantle wedge corner at approximately 30 km depth holds high-pressure water, where many slow earthquakes occur. To quantify how such water behaves during slow earthquakes helps us understand the mechanisms of these earthquakes and (eventually) a part of the long-term water cycle between the interior and surface of the Earth. However, little evidence has thus far been reported on the transient flows of such deep water. Here, we report anomalous, negative mass anomalies during two recent long-term slow slip events in the Tokai area in Japan, which were detected by absolute gravity measurements over 20 years. We present a poroelastic fluid flow model assuming a localized deformation within the fault fracture zone. The model can reproduce the gravity change with a permeability range between those suggested by laboratory experiments and numerical simulations of slow earthquakes.http://link.springer.com/article/10.1186/s40623-018-0797-5GravitySlow earthquakesSlow slipPoroelasticityWaterGNSS |
| spellingShingle | Yoshiyuki Tanaka Takehito Suzuki Yuichi Imanishi Shuhei Okubo Xinlin Zhang Miwako Ando Atsushi Watanabe Mamoru Saka Chiaki Kato Shuichi Oomori Yoshifumi Hiraoka Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips Earth, Planets and Space Gravity Slow earthquakes Slow slip Poroelasticity Water GNSS |
| title | Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips |
| title_full | Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips |
| title_fullStr | Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips |
| title_full_unstemmed | Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips |
| title_short | Temporal gravity anomalies observed in the Tokai area and a possible relationship with slow slips |
| title_sort | temporal gravity anomalies observed in the tokai area and a possible relationship with slow slips |
| topic | Gravity Slow earthquakes Slow slip Poroelasticity Water GNSS |
| url | http://link.springer.com/article/10.1186/s40623-018-0797-5 |
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