Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence
We analysed the one-year-long seismic swarm at the Alban Hills volcano which occurred during 1989-1990. We portray spatial distribution of seismic moment release, better delineating the activated volume during the swarm. The seismic structure is imaged as a 7-km long, 3-km wide, and 3-km thick volum...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
1998-06-01
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| Series: | Annals of Geophysics |
| Subjects: | |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4332 |
| _version_ | 1811221236683898880 |
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| author | F. D'Ajello Caracciolo G. Selvaggi |
| author_facet | F. D'Ajello Caracciolo G. Selvaggi |
| author_sort | F. D'Ajello Caracciolo |
| collection | DOAJ |
| description | We analysed the one-year-long seismic swarm at the Alban Hills volcano which occurred during 1989-1990. We portray spatial distribution of seismic moment release, better delineating the activated volume during the swarm. The seismic structure is imaged as a 7-km long, 3-km wide, and 3-km thick volume, located between 2 and 5 km depth, and NW-SE striking. Fault plane solutions and scalar seismic moments for the largest earthquakes provide the description of the average strain rate tensor. The principal strain rate axes show a dominant extension in NE-SW direction, a SE-NW direction of compression and a negligible thickening rate. P and T axes direction of the smaller earthquakes suggests that the same mode of deformation is distributed all over the activated volume. These results are discussed in terms of seismic deforming processes active at the Alban Hills volcano, in the frame of magmatic inflation recently invoked to explain the rapid vertical uplift affecting part of the volcano. The observed average deformation is consistent with shear failures occurring on faults connecting stress-oriented dykes in response to an increasing fluid pressure. |
| first_indexed | 2024-04-12T07:55:58Z |
| format | Article |
| id | doaj.art-a756c1a833dd44718c09ab9ce1a797ae |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-04-12T07:55:58Z |
| publishDate | 1998-06-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-a756c1a833dd44718c09ab9ce1a797ae2022-12-22T03:41:30ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X1998-06-0141210.4401/ag-4332Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequenceF. D'Ajello CaraccioloG. SelvaggiWe analysed the one-year-long seismic swarm at the Alban Hills volcano which occurred during 1989-1990. We portray spatial distribution of seismic moment release, better delineating the activated volume during the swarm. The seismic structure is imaged as a 7-km long, 3-km wide, and 3-km thick volume, located between 2 and 5 km depth, and NW-SE striking. Fault plane solutions and scalar seismic moments for the largest earthquakes provide the description of the average strain rate tensor. The principal strain rate axes show a dominant extension in NE-SW direction, a SE-NW direction of compression and a negligible thickening rate. P and T axes direction of the smaller earthquakes suggests that the same mode of deformation is distributed all over the activated volume. These results are discussed in terms of seismic deforming processes active at the Alban Hills volcano, in the frame of magmatic inflation recently invoked to explain the rapid vertical uplift affecting part of the volcano. The observed average deformation is consistent with shear failures occurring on faults connecting stress-oriented dykes in response to an increasing fluid pressure.http://www.annalsofgeophysics.eu/index.php/annals/article/view/4332Seismic moment releaseaverage strain rate tensorAlban Hills volcano |
| spellingShingle | F. D'Ajello Caracciolo G. Selvaggi Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence Annals of Geophysics Seismic moment release average strain rate tensor Alban Hills volcano |
| title | Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence |
| title_full | Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence |
| title_fullStr | Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence |
| title_full_unstemmed | Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence |
| title_short | Seismic deformation at the Alban Hills volcano during the 1989-1990 seismic sequence |
| title_sort | seismic deformation at the alban hills volcano during the 1989 1990 seismic sequence |
| topic | Seismic moment release average strain rate tensor Alban Hills volcano |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4332 |
| work_keys_str_mv | AT fdajellocaracciolo seismicdeformationatthealbanhillsvolcanoduringthe19891990seismicsequence AT gselvaggi seismicdeformationatthealbanhillsvolcanoduringthe19891990seismicsequence |