Near-field seismic displacement and tilt associated with the explosive activity of Stromboli
Broadband seismic recordings in the near-field of Strombolian explosions, at 500 m distance, show pronounced effects of tilt. The tilt signal is predominant in the horizontal components beyond about 50 s period while it is negligible in the vertical component. The waveform of the tilt signal at the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
1999-06-01
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| Series: | Annals of Geophysics |
| Subjects: | |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/3723 |
| _version_ | 1819133912217026560 |
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| author | T. Forbriger E. Wielandt |
| author_facet | T. Forbriger E. Wielandt |
| author_sort | T. Forbriger |
| collection | DOAJ |
| description | Broadband seismic recordings in the near-field of Strombolian explosions, at 500 m distance, show pronounced effects of tilt. The tilt signal is predominant in the horizontal components beyond about 50 s period while it is negligible in the vertical component. The waveform of the tilt signal at the seismometer output is a double time integral of the waveform due to ground displacement. Since the waveform of the displacement is known from the vertical component, the waveform of the tilt signal in the horizontal seismogram can be reconstructed and both contributions can be separated from each other with a linear regression. We have analyzed data recorded in the summit region of Stromboli in 1995 and 1996. The regional tilt can be determined from the differential vertical displacement between instruments a few tens of meters apart. Local tilts determined with individual instruments scatter around the regional value, most probably due to local strain-tilt-coupling. Mogi's (1958) formulae for a pressure source in a homogeneous halfspace are used to interpret the results. The source displaces a volume of several tens of cubic meters of the surrounding rock before the explosive discharge; typical volumes were 25 m3 in July 1995 and 60 m3 in September 1996. |
| first_indexed | 2024-12-22T09:54:50Z |
| format | Article |
| id | doaj.art-fbb3f98f3be64ab38ad8e1eb7cfb61b0 |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-12-22T09:54:50Z |
| publishDate | 1999-06-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-fbb3f98f3be64ab38ad8e1eb7cfb61b02022-12-21T18:30:18ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X1999-06-0142310.4401/ag-3723Near-field seismic displacement and tilt associated with the explosive activity of StromboliT. ForbrigerE. WielandtBroadband seismic recordings in the near-field of Strombolian explosions, at 500 m distance, show pronounced effects of tilt. The tilt signal is predominant in the horizontal components beyond about 50 s period while it is negligible in the vertical component. The waveform of the tilt signal at the seismometer output is a double time integral of the waveform due to ground displacement. Since the waveform of the displacement is known from the vertical component, the waveform of the tilt signal in the horizontal seismogram can be reconstructed and both contributions can be separated from each other with a linear regression. We have analyzed data recorded in the summit region of Stromboli in 1995 and 1996. The regional tilt can be determined from the differential vertical displacement between instruments a few tens of meters apart. Local tilts determined with individual instruments scatter around the regional value, most probably due to local strain-tilt-coupling. Mogi's (1958) formulae for a pressure source in a homogeneous halfspace are used to interpret the results. The source displaces a volume of several tens of cubic meters of the surrounding rock before the explosive discharge; typical volumes were 25 m3 in July 1995 and 60 m3 in September 1996.http://www.annalsofgeophysics.eu/index.php/annals/article/view/3723Strombolivolcano seismologyseismic tiltMogi modelsource mechanism |
| spellingShingle | T. Forbriger E. Wielandt Near-field seismic displacement and tilt associated with the explosive activity of Stromboli Annals of Geophysics Stromboli volcano seismology seismic tilt Mogi model source mechanism |
| title | Near-field seismic displacement and tilt associated with the explosive activity of Stromboli |
| title_full | Near-field seismic displacement and tilt associated with the explosive activity of Stromboli |
| title_fullStr | Near-field seismic displacement and tilt associated with the explosive activity of Stromboli |
| title_full_unstemmed | Near-field seismic displacement and tilt associated with the explosive activity of Stromboli |
| title_short | Near-field seismic displacement and tilt associated with the explosive activity of Stromboli |
| title_sort | near field seismic displacement and tilt associated with the explosive activity of stromboli |
| topic | Stromboli volcano seismology seismic tilt Mogi model source mechanism |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/3723 |
| work_keys_str_mv | AT tforbriger nearfieldseismicdisplacementandtiltassociatedwiththeexplosiveactivityofstromboli AT ewielandt nearfieldseismicdisplacementandtiltassociatedwiththeexplosiveactivityofstromboli |