Publikationsdatum:
2020-12-15
Beschreibung:
Empirical scaling relationships between fault or
slip dimensions and earthquake magnitudes are often used
to assess the maximum possible earthquake magnitude of a
territory. Upon the assumption of the reactivability of any
fault, the earthquake magnitudes derived from the surface
fault length (FLEM) are compared at the national scale in
Italy against catalogued magnitudes. FLEMs are obtained
by considering a comprehensive fault dataset regardless of
fault age, stress field orientation, strain rate, etc. In particular,
(1) a comprehensive catalogue of all known faults is
compiled by merging the most complete databases available;
(2) FLEM is then derived from fault length; and (3) the resulting
FLEMs are compared (i.e. the mathematical difference)
with catalogued earthquake magnitudes. Results show
that the largest FLEMs as well as the largest differences between
FLEMs and catalogued magnitudes are observed for
poorly constrained faults, mainly inferred from subsurface
data. It is suggested that these areas have to be further characterized
to better estimate fault dimension and segmentation
and hence properly assess the FLEM. Where, in contrast, the
knowledge of faults is geologically well constrained, the calculated
FLEM is often consistent with the catalogued seismicity,
with the 2 value of the distribution of differences
being 1.47 and reducing to 0.53 when considering only the
Mw 6:5 earthquakes. Our work highlights areas, in Italy,
where further detailed studies on faults are required.
Beschreibung:
Published
Beschreibung:
1555–1579
Beschreibung:
4T. Sismicità dell'Italia
Beschreibung:
JCR Journal
Schlagwort(e):
Italy
;
Seismicity
;
Itaalian seismicity
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
article
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