Recent seismicity before the 24 August 2016 Mw 6.0 Central Italy Earthquake as recorded by the ReSIICO seismic network

The seismicity of the last four years before the August 24 2016 01:36 UTC MW 6.0 earthquake that struck central Italy is presented with the aim to understand the preparatory phase of the event. In contrast with the 2009 L’Aquila earthquake that was preceded by a seismic sequence and the 2013-2015 Gubbio seismic swarm that, to date, is ended without any strong event, our preliminary results don’t show seismic sequences in the last months previous the mainshock of the August 24 2016 and a low similarity between seismicity clusters in the last four years and the foreshocks.

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Assessing soil-structure interaction during the 2016 Central Italy seismic sequence (Italy): preliminary results

Annals of Geophysics ◽

10.4401/ag-7250 ◽

2016 ◽

Vol 59 ◽

Author(s):

Arrigo Caserta ◽

Fawzi Doumaz ◽

Antonio Costanzo ◽

Anna Gervasi ◽

William Thorossian ◽

...

Keyword(s):

Soil Structure ◽

Central Italy ◽

Seismic Energy ◽

Soil Structure Interaction ◽

Seismic Sequence ◽

Structure Interaction ◽

Preliminary Results ◽

The Church ◽

Moderate Magnitude

We used the moderate-magnitude aftershocks succeeding to the 2016 August 24th, Mw = 6.0, Amatrice (Italy) mainshok to asses, specially during an ongoing seismic sequence, the soil-structure interaction where cultural Heritage is involved. We have chosen as case study the San Giovanni Battista church (A.D. 1039) in Acquasanta Terme town, about 20 Km northeast of Amatrice. First of all we studied the soil shaking features in order to characterize the input to the monument. Then, using the recordings in the church, we tried to figure out how the input seismic energy is distributed over the different monument parts. Some preliminary results are shown and discussed.

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Quantitative Estimate of the Long-Term Slip Rate of the Normal Fault Responsible for the 2009 L’Aquila Earthquake (Mw 6.1) (Central Italy) Through Tectonic Geomorphology Approaches

SSRN Electronic Journal ◽

10.2139/ssrn.3946268 ◽

2021 ◽

Author(s):

Irene Puliti ◽

Stefano Pucci ◽

Fabio Villani ◽

Massimiliano Porreca ◽

Lucilla Benedetti ◽

...

Keyword(s):

Quantitative Estimate ◽

Central Italy ◽

Slip Rate ◽

Normal Fault ◽

Tectonic Geomorphology ◽

L’Aquila Earthquake ◽

2009 L’Aquila Earthquake

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Seismic velocity precursors to the 2016 Mw 6.5 Norcia (Italy) earthquake

Geology ◽

10.1130/g47048.1 ◽

2020 ◽

Vol 48 (9) ◽

pp. 924-928 ◽

Cited By ~ 3

Author(s):

C. Chiarabba ◽

P. De Gori ◽

M. Segou ◽

M. Cattaneo

Keyword(s):

Seismic Velocity ◽

Time Windows ◽

Central Italy ◽

Active Faults ◽

Central Italy Earthquake ◽

Preparatory Phase ◽

Triggering Mechanisms ◽

Failure Conditions ◽

Deformation Patterns

Abstract Earthquakes occur as the result of long-term strain accumulation on active faults and complex transient triggering mechanisms. Although laboratory experiments show accelerating deformation patterns before failure conditions are met, imaging similar preparatory phases in nature remains difficult because it requires dense monitoring in advance. The 2016 Amatrice-Visso-Norcia (central Italy) earthquake cascade, captured by an unprecedented seismic network, provided a unique testing ground to image the preparatory phase of a large event. The crustal volume of the Norcia incipient fault was densely illuminated by seismic rays from more than 13,000 earthquakes that occurred within the 3 mo before the main shock nucleation. We performed seismic tomography in distinct time windows that revealed the precursory changes of elastic wave speed, signaling (1) the final locked state of the fault, and (2) the rapid fault-stiffness alterations near the hypocenter just a few weeks before the event. The results are the first instance where short-lived, hard-to-catch crustal properties shed light on evolving earthquake cascades.

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Soil gas geochemical behaviour across buried and exposed faults during the 24 august 2016 central Italy earthquake

Annals of Geophysics ◽

10.4401/ag-7242 ◽

2016 ◽

Vol 59 ◽

Author(s):

Giancarlo Ciotoli ◽

Alessandra Sciarra ◽

Livio Ruggiero ◽

Aldo Annunziatellis ◽

Sabina Bigi

Keyword(s):

Active Fault ◽

Central Italy ◽

Soil Gas ◽

Seismic Sequence ◽

Spatial Behaviour ◽

Fault Rupture ◽

Central Italy Earthquake ◽

Geochemical Behaviour ◽

Buried Fault ◽

Soil Gas Survey

Following the earthquake (ML=6.0) of 24 August 2016 that affected large part of the central Apennine between the municipalities of Norcia (PG) and Amatrice (RI) (central Italy), two soil gas profiles (i.e., 222Rn, 220Rn, CO2 and CO2 flux) were carried out across buried and exposed coseismic fault rupture of the Mt. Vettore fault during the seismic sequence. The objective of the survey was to explore the mechanisms of migration and the spatial behaviour of different gas species near still-degassing active fault. Results provide higher gas and CO2 flux values (about twice for 222Rn and CO2 flux) in correspondence of the buried sector of the fault than those measured across the exposed coseismic rupture. Anomalous peaks due to advective migration are clearly visible on both side of the buried fault (profile 1), whereas the lower soil gas concentrations measured across the exposed coseimic rupture (profile 2) are mainly caused by shallow and still acting diffusive degassing associated to faulting during the seismic sequence. These results confirm the usefulness of the soil gas survey to spatially recognise the shallow geometry of hidden faults, and to discriminate the geochemical migration mechanisms occurring at buried and exposed faults related to seismic activity.

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