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Sirovich, L.; Pettenati, F.; Chiaruttini, C.

doi:10.1023/a:1011856522161

Cited by 15 publications

(1 citation statement)

References 32 publications

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“…We do not describe the whole procedure again, but highlight that the results are nondimensional values of KF(x,y) at locations x,y (referred to a Cartesian plane). The KF(x,y) data are then converted into pseudo-intensities by the semi-empirical by a data-fitting function (2) in Sirovich et al (2001) We adopt the convention of the positive direction of the strike ranging from 0° to 360°, with the fault plane dipping to the right. According to this, rake angles ranging between 1° to 179° indicate faults with inverse (compressive) components.…”

Section: Model Kfmentioning

confidence: 99%

The Ljubljana 1895 earthquake: source parametres from the inversion of macroseismic data

Jukić

Pettenati

Sirovich³

et al. 2023

Preprint

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The 14 April 1895 earthquake (Mw 6.1, in the Ljubljana area, Slovenia) is still not fully explained. The aim of this paper is to derive information on its source from the inversion of an updated dataset of intensities (evaluated using EMS-98). This was done by the KF-NGA automatic non-linear geophysical inversion, with a Niching Genetic Algorithm technique, already presented in other articles. The distribution of damage caused by this earthquake is not homogeneous, often with significant differences of intensity between neighboring sites. The statistical analysis of intensities, epicentral distances and sites geology suggests some site effects. Despite this, the resulting solution is compatible with the regional seismotectonics, i.e. an almost pure dip-slip mechanism: strike angle 282°5°, dip 38°±7°, rake 86°±9° (±180° because of the intrinsic ambiguity of the KF-NGA inversion). Since the rake angle is close to 90°, there is an almost perfect ambiguity between the two planes of the focal mechanism. Thus, our solution has a Dinaric direction and could be associated with either a fault plane dipping NE or with one dipping SW.

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Section: Model Kfmentioning

confidence: 99%

The Ljubljana 1895 earthquake: source parametres from the inversion of macroseismic data

Jukić

Pettenati

Sirovich³

et al. 2023

Preprint

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Intensity‐based source inversion of the destructive earthquake of 1694 in the southern Apennines, Italy

2013

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[1] We inverted the regional pattern of intensities of the catastrophic earthquake of 1694 in the southern Apennines and determined the geometrical and kinematic characteristics of its source, including the double-couple orientation (strike angle 299°± 10°, dip 54°± 12°, and rake 309°± 11°; pure dip-slip solution not precluded). The objective nonlinear inversion was performed using the simple 11 parameter kinematic-function model (KF) with a niching genetic algorithm technique. The similarity between the pattern of the field intensities of the 1694 earthquake and the synthetic pattern is striking. This result is supported by the fact that our inversion technique was verified in the study area, where it was able to again find the source of the M s 6.9 Irpinia 1980 earthquake, known from instruments and from field surveys of the rupture. This type of inversion enables researchers to exploit the extensive intensity data from Italy and other countries to extend the knowledge of seismotectonic activity to preinstrumental times. New paleoseismological evidence and even published descriptions of the fault rupture by witnesses of the 1694 earthquake were found, confirming our results. We also present and apply a new algorithm, of general interest, to calculate disorientations between double-couples via standard linear algebra. The 3-D rotations that bring the pairwise orthogonal unit vectors that were estimated by our intensity inversion into the instrumental triples of the 1980 Irpinia earthquake, assumed as benchmarks, provide verification of our algorithm.

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Source inversion of the 1570 Ferrara earthquake and definitive diversion of the Po River (Italy)

Sirovich

Pettenati

2015

JGR Solid Earth

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An 11‐parameter, kinematic‐function (KF) model was used to retrieve the approximate geometrical and kinematic characteristics of the fault source of the 1570 Mw 5.8 Ferrara earthquake in the Po Plain, including the double‐couple orientation (strike angle 127 ± 16°, dip 28 ± 7°, and rake 77 ± 16°). These results are compatible with either the outermost thrust fronts of the northern Apennines, which are buried beneath the Po Plain's alluvial deposits, or the blind crustal‐scale thrust. The 1570 event developed to the ENE of the two main shocks on 20 May 2012 (M 6.1) and 29 May 2012 (M 5.9). The three earthquakes had similar kinematics and are found 20–30 km from each other en echelon in the buried chain. Geomorphological and historical evidence exist which suggest the following: (i) the long‐lasting uplift of the buried Apenninic front shifted the central part of the course of the Po River approximately 20 km northward in historical times and (ii) the 1570 earthquake marked the definitive diversion of the final part of the Po River away from Ferrara and the closure of the Po delta 40 km south of its present position.

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Untitled

Cited by 15 publications

References 32 publications

The Ljubljana 1895 earthquake: source parametres from the inversion of macroseismic data

The Ljubljana 1895 earthquake: source parametres from the inversion of macroseismic data

Intensity‐based source inversion of the destructive earthquake of 1694 in the southern Apennines, Italy

Source inversion of the 1570 Ferrara earthquake and definitive diversion of the Po River (Italy)

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