Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure
Seismic swarms frequently occur along continental fault systems and their relation with large earthquakes is often contradictory. Such a case is documented in the Pollino mountain range of southern Italy, a decoupling zone where the belt-normal stretching drastically rotates accommodating the differ...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-11-01
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| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.968187/full |
| _version_ | 1797988877009420288 |
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| author | Pasquale De Gori Francesco Pio Lucente Aladino Govoni Lucia Margheriti Claudio Chiarabba |
| author_facet | Pasquale De Gori Francesco Pio Lucente Aladino Govoni Lucia Margheriti Claudio Chiarabba |
| author_sort | Pasquale De Gori |
| collection | DOAJ |
| description | Seismic swarms frequently occur along continental fault systems and their relation with large earthquakes is often contradictory. Such a case is documented in the Pollino mountain range of southern Italy, a decoupling zone where the belt-normal stretching drastically rotates accommodating the differential SE-retreat of the Ionian slab. The paucity of historical large earthquakes has led to hypothesize the presence of a seismic gap. A long-lasting seismic swarm that climaxed with a ML = 5.2 earthquake in October 2012 was therefore thought as a possible signal of an impending large earthquake filling the gap. Seismicity data collected during a 4-years long monitoring are a powerful microscope to look through the seismic swarm. In this study, we present accurate relocations for 2385 earthquakes and high-resolution Vp and Vp/Vs models of the fault system. Seismicity occurred on two separate normal faults that were formerly part of a thrusts and back-thrusts system, originally formed as a pop-up at restraining bends of the Pollino fault, a wrench fault system that inverted the original left lateral sense of slip accommodating a differential motion induced by the southward retreat of the Ionian slab. |
| first_indexed | 2024-04-11T08:11:07Z |
| format | Article |
| id | doaj.art-212c7c10074d4364879a6248baafc6bd |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-11T08:11:07Z |
| publishDate | 2022-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-212c7c10074d4364879a6248baafc6bd2022-12-22T04:35:21ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-11-011010.3389/feart.2022.968187968187Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structurePasquale De GoriFrancesco Pio LucenteAladino GovoniLucia MargheritiClaudio ChiarabbaSeismic swarms frequently occur along continental fault systems and their relation with large earthquakes is often contradictory. Such a case is documented in the Pollino mountain range of southern Italy, a decoupling zone where the belt-normal stretching drastically rotates accommodating the differential SE-retreat of the Ionian slab. The paucity of historical large earthquakes has led to hypothesize the presence of a seismic gap. A long-lasting seismic swarm that climaxed with a ML = 5.2 earthquake in October 2012 was therefore thought as a possible signal of an impending large earthquake filling the gap. Seismicity data collected during a 4-years long monitoring are a powerful microscope to look through the seismic swarm. In this study, we present accurate relocations for 2385 earthquakes and high-resolution Vp and Vp/Vs models of the fault system. Seismicity occurred on two separate normal faults that were formerly part of a thrusts and back-thrusts system, originally formed as a pop-up at restraining bends of the Pollino fault, a wrench fault system that inverted the original left lateral sense of slip accommodating a differential motion induced by the southward retreat of the Ionian slab.https://www.frontiersin.org/articles/10.3389/feart.2022.968187/fullseismic swarmseismic gapearthquake locationtomographic modelfault weakeningpop-up structures |
| spellingShingle | Pasquale De Gori Francesco Pio Lucente Aladino Govoni Lucia Margheriti Claudio Chiarabba Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure Frontiers in Earth Science seismic swarm seismic gap earthquake location tomographic model fault weakening pop-up structures |
| title | Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure |
| title_full | Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure |
| title_fullStr | Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure |
| title_full_unstemmed | Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure |
| title_short | Seismic swarms in the Pollino seismic gap: Positive fault inversion within a popup structure |
| title_sort | seismic swarms in the pollino seismic gap positive fault inversion within a popup structure |
| topic | seismic swarm seismic gap earthquake location tomographic model fault weakening pop-up structures |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.968187/full |
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