Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake
Abstract The 30 May 2015 Chichi‐jima M8 earthquake is one of the largest deep focus earthquakes ever recorded and its depth of 682 km puts it near the base of the mantle transition zone. Before source mechanisms and slip models of this earthquake can be reliably assessed, a better understanding of t...
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| Format: | Article |
| Language: | English |
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Wiley
2016-05-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL068168 |
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| _version_ | 1849725698712797184 |
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| author | Robert W. Porritt Shoichi Yoshioka |
| author_facet | Robert W. Porritt Shoichi Yoshioka |
| author_sort | Robert W. Porritt |
| collection | DOAJ |
| description | Abstract The 30 May 2015 Chichi‐jima M8 earthquake is one of the largest deep focus earthquakes ever recorded and its depth of 682 km puts it near the base of the mantle transition zone. Before source mechanisms and slip models of this earthquake can be reliably assessed, a better understanding of the tectonic setting and structures of the region near the origin is required. Here we present evidence from receiver functions, a method of isolating subsurface material contrast with converted seismic waves, that the earthquake initiated within the upper mantle transition zone, above a significantly depressed 660 km phase boundary. Additionally, we observe multiple conversions within and below the transition zone, which we associate with seismic waves passing into and out of segments of the subducting Pacific plate. From this, we infer slab material is piling up at the base of the transition zone and segments are penetrating into the lower mantle. |
| format | Article |
| id | doaj-art-9905f06fa810435cbd84e5a798a1f2c0 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9905f06fa810435cbd84e5a798a1f2c02025-08-20T03:10:24ZengWileyGeophysical Research Letters0094-82761944-80072016-05-0143104905491210.1002/2016GL068168Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquakeRobert W. Porritt0Shoichi Yoshioka1Research Center for Urban Safety and Security Kobe University Kobe JapanResearch Center for Urban Safety and Security Kobe University Kobe JapanAbstract The 30 May 2015 Chichi‐jima M8 earthquake is one of the largest deep focus earthquakes ever recorded and its depth of 682 km puts it near the base of the mantle transition zone. Before source mechanisms and slip models of this earthquake can be reliably assessed, a better understanding of the tectonic setting and structures of the region near the origin is required. Here we present evidence from receiver functions, a method of isolating subsurface material contrast with converted seismic waves, that the earthquake initiated within the upper mantle transition zone, above a significantly depressed 660 km phase boundary. Additionally, we observe multiple conversions within and below the transition zone, which we associate with seismic waves passing into and out of segments of the subducting Pacific plate. From this, we infer slab material is piling up at the base of the transition zone and segments are penetrating into the lower mantle.https://doi.org/10.1002/2016GL068168Chichi‐jima earthquakereceiver functionsmantle transition zoneslab morphology |
| spellingShingle | Robert W. Porritt Shoichi Yoshioka Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake Geophysical Research Letters Chichi‐jima earthquake receiver functions mantle transition zone slab morphology |
| title | Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake |
| title_full | Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake |
| title_fullStr | Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake |
| title_full_unstemmed | Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake |
| title_short | Slab pileup in the mantle transition zone and the 30 May 2015 Chichi‐jima earthquake |
| title_sort | slab pileup in the mantle transition zone and the 30 may 2015 chichi jima earthquake |
| topic | Chichi‐jima earthquake receiver functions mantle transition zone slab morphology |
| url | https://doi.org/10.1002/2016GL068168 |
| work_keys_str_mv | AT robertwporritt slabpileupinthemantletransitionzoneandthe30may2015chichijimaearthquake AT shoichiyoshioka slabpileupinthemantletransitionzoneandthe30may2015chichijimaearthquake |