New constraints shed light on strike-slip faulting beneath the southern Apennines (Italy): The 21 August 1962 Irpinia multiple earthquake

Vannoli, Paola; Bernardi, Fabrizio; Palombo, Barbara; Vannucci, Gianfranco; Console, Rodolfo; Ferrari, Graziano

doi:10.1016/j.tecto.2016.10.032

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…For the 1962 sequence, published focal solutions for the two M ∼ 6 shocks are debated and vary from NW‐striking transtensional mechanism Westaway (1987) to E‐W striking pure strike‐slip mechanism Vannoli et al. (2016), although their hypocenters have been located at upper crustal depths (<10 km). In September 2012, a M W 4.2 earthquake occurred in this region at a depth of ∼10 km (http://iside.rm.ingv.it/event/1335371) and published focal solutions varies again from a NW‐trending transtensional mechanism (Scognamiglio et al., 2006) to a pure strike‐slip mechanism trending E‐W (Adinolfi et al., 2015).…”

Section: Resultsmentioning

confidence: 99%

“…However, such a regional seismotectonic zonation seems inappropriate for the region encompassing the southern Sannio and northern Irpinia, which was struck by M6+ earthquakes in 1702, 1732, 1962 (see Figure 8, panel a). For the 1962 sequence, published focal solutions for the two M ∼ 6 shocks are debated and vary from NW-striking transtensional mechanism Westaway (1987) to E-W striking pure strike-slip mechanism Vannoli et al (2016), although their hypocenters have been located at upper crustal depths (<10 km). In September 2012, a M W 4.2 earthquake occurred in this region at a depth of ∼10 km (http://iside.rm.…”

Section: Seismicity Distribution In the Sannio Areamentioning

confidence: 99%

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A High‐Resolution Seismic Catalog for the Southern Apennines (Italy) Built Through Template‐Matching

Diaferia,

Valoroso,

Improta

et al. 2024

Geochem Geophys Geosyst

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The incompleteness of earthquake catalogs is a well‐known issue caused by our technical limitation in detecting the small‐to very small‐magnitude seismicity falling near or below the background seismic noise. The detection of small‐magnitude events is fundamental for improving our knowledge of geometry and kinematics of seismogenic sources and the spatio‐temporal characteristics of seismicity, thus leading to better models for seismic hazard. Template‐matching (TM) is a powerful technique that, based on similarity measure (cross‐correlation) of seismic waveforms, allows to detect hidden earthquakes that are similar to known events (called templates). The high computational effort often limits such technique to small areas and for short time frames (less than 1 year). In this work, we present the first application of template‐matching at regional scale for the Italian Peninsula, focusing on the Southern Apennines. We use about 3,600 high‐quality events as templates, scanning 6‐year long continuous recordings (2009–2014), at more than 180 stations of the INGV network. About 20,000 new events are found, showing a comparable quality to the template catalog in terms of hypocentral solution, reaching a decrease of the magnitude of completeness of about one unit. To highlight the improved quality of the TM catalog, we report two main examples regarding the Sannio‐Matese area, where TM allowed us to unravel relevant details on the spatio‐temporal distribution of the local seismicity.

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Section: Resultsmentioning

confidence: 99%

Section: Seismicity Distribution In the Sannio Areamentioning

confidence: 99%

A High‐Resolution Seismic Catalog for the Southern Apennines (Italy) Built Through Template‐Matching

Diaferia,

Valoroso,

Improta

et al. 2024

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…The 1962 sequence is composed of three different shocks at 18:09, 18:19, and 18:44 UTC, the second being the most destructive (Io IX MCS, Mw 6.1, [25]). Additionally, identification of the faults responsible for these earthquakes is difficult because of the lack of reported surface faulting.…”

Section: Stain Rate In Irpiniamentioning

confidence: 99%

“…Additionally, identification of the faults responsible for these earthquakes is difficult because of the lack of reported surface faulting. Only in 2016 was a reliable focal mechanism produced [25] with two solutions: dominant strike-slip rupture along a north-dipping, E-W striking plane, or along a west-dipping, N-S striking plane. Its depth is still controversial, varying between 7 and 35 km.…”

Section: Stain Rate In Irpiniamentioning

confidence: 99%

Assessing Current Seismic Hazards in Irpinia Forty Years after the 1980 Earthquake: Merging Historical Seismicity and Satellite Data about Recent Ground Movements

2021

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Recently, a new strain rate map of Italy and the surrounding areas has been obtained by processing data acquired by the persistent scatterers (PS) of the synthetic aperture radar interferometry (InSAR) satellites—ERS and ENVISAT—between 1990 and 2012. This map clearly shows that there is a link between the strain rate and all the shallow earthquakes (less than 15 km deep) that occurred from 1990 to today, with their epicenters being placed only in high strain rate areas (e.g., Emilia plain, NW Tuscany, Central Apennines). However, the map also presents various regions with high strain rates but in which no damaging earthquakes have occurred since 1990. One of these regions is the Apennine sector, formed by Sannio and Irpinia. This area represents one of the most important seismic districts with a well-known and recorded seismicity from Roman times up to the present day. In our study, we merged historical records with new satellite techniques that allow for the precise determination of ground movements, and then derived physical dimensions, such as strain rate. In this way, we verified that in Irpinia, the occurrence of new strong shocks—forty years after one of the strongest known seismic events in the district that occurred on the 23 November 1980, measuring Mw 6.8—is still a realistic possibility. The reason for this is that, from 1990, only areas characterized by high strain rates have hosted significant earthquakes. This picture has been also confirmed by analyzing the historical catalog of events with seismic completeness for magnitude M ≥ 6 over the last four centuries. It is easy to see that strong seismic events with magnitude M ≥ 6 generally occurred at a relatively short time distance between one another, with a period of 200 years without strong earthquakes between the years 1732 and 1930. This aspect must be considered as very important from various points of view, particularly for civil protection plans, as well as civil engineering and urban planning development.

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A reappraisal of the 1978 Ferruzzano earthquake (southern Italy) from new estimates of hypocenter location and moment tensor inversion

Orecchio

Scolaro

Batlló

et al. 2019

Physics of the Earth and Planetary Interiors

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New constraints shed light on strike-slip faulting beneath the southern Apennines (Italy): The 21 August 1962 Irpinia multiple earthquake

Cited by 8 publications

References 28 publications

A High‐Resolution Seismic Catalog for the Southern Apennines (Italy) Built Through Template‐Matching

A High‐Resolution Seismic Catalog for the Southern Apennines (Italy) Built Through Template‐Matching

Assessing Current Seismic Hazards in Irpinia Forty Years after the 1980 Earthquake: Merging Historical Seismicity and Satellite Data about Recent Ground Movements

A reappraisal of the 1978 Ferruzzano earthquake (southern Italy) from new estimates of hypocenter location and moment tensor inversion

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