Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone
Abstract Deep low‐frequency tremor triggered by teleseismic surface waves is concentrated in several locations along the ambient tremor source region in the Nankai subduction zone, southwest Japan. We systematically investigated triggered tremor in northern Kii and western Shikoku, at 71 teleseismic...
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| Format: | Article |
| Language: | English |
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Wiley
2018-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL076779 |
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| author | Ryo Kurihara Kazushige Obara Akiko Takeo Takuto Maeda |
| author_facet | Ryo Kurihara Kazushige Obara Akiko Takeo Takuto Maeda |
| author_sort | Ryo Kurihara |
| collection | DOAJ |
| description | Abstract Deep low‐frequency tremor triggered by teleseismic surface waves is concentrated in several locations along the ambient tremor source region in the Nankai subduction zone, southwest Japan. We systematically investigated triggered tremor in northern Kii and western Shikoku, at 71 teleseismic earthquakes by applying a matched filter technique. We detected 9 and 17 events of triggered tremor in northern Kii and western Shikoku, respectively. In addition, we observed tremor migration episodes, whose directions were always along‐dip. In northern Kii, seven episodes showed downward migration at a speed of 5–20 km/hr. In western Shikoku, six episodes migrated at a speed of 10–100 km/hr, in which five episodes showed upward migration. Migration of the triggered tremor suggests that dynamic stress perturbation from distant earthquakes may trigger propagating creep events caused by fluid. |
| format | Article |
| id | doaj-art-a7af896916e34fa3a65658e6e637e7ed |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2018-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a7af896916e34fa3a65658e6e637e7ed2025-08-20T01:55:33ZengWileyGeophysical Research Letters0094-82761944-80072018-04-014583413341910.1002/2017GL076779Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction ZoneRyo Kurihara0Kazushige Obara1Akiko Takeo2Takuto Maeda3Earthquake Research Institute The University of Tokyo Tokyo JapanEarthquake Research Institute The University of Tokyo Tokyo JapanEarthquake Research Institute The University of Tokyo Tokyo JapanEarthquake Research Institute The University of Tokyo Tokyo JapanAbstract Deep low‐frequency tremor triggered by teleseismic surface waves is concentrated in several locations along the ambient tremor source region in the Nankai subduction zone, southwest Japan. We systematically investigated triggered tremor in northern Kii and western Shikoku, at 71 teleseismic earthquakes by applying a matched filter technique. We detected 9 and 17 events of triggered tremor in northern Kii and western Shikoku, respectively. In addition, we observed tremor migration episodes, whose directions were always along‐dip. In northern Kii, seven episodes showed downward migration at a speed of 5–20 km/hr. In western Shikoku, six episodes migrated at a speed of 10–100 km/hr, in which five episodes showed upward migration. Migration of the triggered tremor suggests that dynamic stress perturbation from distant earthquakes may trigger propagating creep events caused by fluid.https://doi.org/10.1002/2017GL076779triggered tremortremor migration |
| spellingShingle | Ryo Kurihara Kazushige Obara Akiko Takeo Takuto Maeda Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone Geophysical Research Letters triggered tremor tremor migration |
| title | Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone |
| title_full | Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone |
| title_fullStr | Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone |
| title_full_unstemmed | Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone |
| title_short | Migration of Deep Low‐Frequency Tremor Triggered by Teleseismic Earthquakes in the Southwest Japan Subduction Zone |
| title_sort | migration of deep low frequency tremor triggered by teleseismic earthquakes in the southwest japan subduction zone |
| topic | triggered tremor tremor migration |
| url | https://doi.org/10.1002/2017GL076779 |
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