Publication Date:
2017-04-03
Description:
Volcanogenic deformations during periods of
unrest are related to volcanic seismicity in various
ways. Magmas or geothermal fluids intrude
beneath volcanoes and cause deformations at the
surface gradually or rapidly. Mechanical energies
of the intrusions are converted to deformation
energy, earthquakes, and also explosions under
certain circumstances. Partition among the
three kinds of energies provides information of
the internal processes and yields a clue to their
origin. From the above standpoint, deformations
accompanying seismicity at Campi Flegrei,
Rabaul and Usu are discussed with the aid of
published data. To quantitatively correlate the
deformations and the seismicity, we discuss the
time-derivatives of uplift and release of seismic
energy, which are energetically interrelated. The
correlation between them is moderate at Campi
Flegrei, somewhat higher at Rabaul and high
at Usu, but the data sets are not always equal
in quality. The deformation volumes are also
different among the three volcanoes. In order
to standardize the volumes, seismic energies
released by unit volume of each deformation are
compared. The specific seismic energy is found
to increase from Campi Flegrei through Rabaul
to Usu. Such different behavior in seismodeformations
among the three volcanoes is
interpreted as differences in the mechanism of
volcanic activity, and in physical properties of the
mediums involved.
Description:
Published
Description:
411-424
Description:
2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
Description:
N/A or not JCR
Description:
open
Keywords:
Deformation
;
seismicity
;
energy release
;
caldera deposits
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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