Study of the seismic sequence of Porto San Giorgio (Marche)–3 July 1987

Riguzzi, Federica; Tertulliani, Andrea; Gasparini, Calvino

doi:10.1007/bf02525078

Cited by 29 publications

(18 citation statements)

References 7 publications

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“…3; Table 2). In the Marche-Adriatic area, prevailing strike-slip kinematics characterise the 1972 Ancona seismic sequence (M w 4.8, Gasparini et al 1985), whereas prevailing reverse solutions are typical of the 1987 Porto S. Giorgio sequence (M w 4.6, Riguzzi et al 1989) and of the remaining selected events. In any case, all the mechanisms show nearly-horizontal NE-SW to E-W trending P axes.…”

Section: Fault Plane Solutionsmentioning

confidence: 99%

“…3, 5). Source of data: CPTI04 parametric catalogue (Working group CPTI 2004a), ABAR 2000(Azzaro and Barbano 2000), A&J87 (Anderson and Jackson 1987), BAR1897 (Baratta 1897), CFTI(Boschi et al 2000), DBMI04(Stucchi et al 2007), G85(Gasparini et al 1985), C73(Console et al 1973), PO06(Pondrelli et al 2006), POS85(Postpischl 1985), R89(Riguzzi et al 1989), R99(Rigano et al 1999), CSI1.1(Castello et al 2005) H depth from instrumental data, M w moment magnitude derived from the moment tensor solution, M aw moment magnitude derived from the macroseismic field in the case of the historical earthquakes and through a weighted average procedure which considers both the macroseismic and the instrumental information in the case of early instrumental and instrumental events(Working Group MPS 2004b) …”

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confidence: 99%

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Rates of active compressional deformation in central Italy and Sicily: evaluation of the seismic budget

Visini

Nardis

Lavecchia

2009

Int J Earth Sci (Geol Rundsch)

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Historical and recent seismicity records and available source mechanisms in eastern-central Italy (Marche-Adriatic region), in mainland-southern Sicily and in the Tyrrhenian offshore of northern Sicily show comparable deformation patterns. Seismotectonic considerations indicate that each of the three areas represents a broad seismogenic province of relatively homogeneous deformation. On the basis of the historical earthquake catalogue, the parameters of the Gutenberg-Richter distribution have been calculated by means of a Monte Carlo simulation method. The average moment tensors have been computed from focal mechanism data and the strain rate and velocity tensors evaluated by means of Kostrov's (in Izv Acad Sci USSR Phys Solid Earth 1: 1974) relation, which also considers the shape and size of the seismogenic volume. The uncertainties have been systematically incorporated. The results show that the three seismotectonic provinces are all undergoing shortening at seismic rates (*0.3 mm/year in the WSW-ENE direction in the eastern Marche-Adriatic region, *0.1 mm/year in the N-S direction in mainland-southern Sicily and *0.2 mm/year in the NW-SE direction in the Southern Tyrrhenian zone). The motion pattern in the MarcheAdriatic and in the Sicilian provinces suggests that these areas undergo active crust-scale deformation along reverse shear zones, in agreement with recent horizontal GPS motion model and other independent evidence.

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Section: Fault Plane Solutionsmentioning

confidence: 99%

mentioning

confidence: 99%

Rates of active compressional deformation in central Italy and Sicily: evaluation of the seismic budget

Visini

Nardis

Lavecchia

2009

Int J Earth Sci (Geol Rundsch)

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“…CMT solutions (compressional quadrants in light grey) (from N to S) of the Parma (1983), Perugia (1984) and Norcia (1979) earthquakes. Fault-plane solutions of the four largest events of the Porto San Giorgio sequence of July 1987 (compressional quadrants in dark grey) from Riguzzi et al (1989). (1984) earthquakes and the focal mechanisms of four events of the Porto San Giorgio seismic sequence of July 1987 (Riguzzi, Tertulliani & Gasparini 1989).…”

Section: Introductionmentioning

confidence: 99%

“…The seismic sequence of Porto San Giorgio of July 1987, approximately 50 km south of Ancona, was studied by Riguzzi et al (1989). This sequence had four events with magnitudes ranging between 4.0 and 4.5, for which the authors determined fault-plane solutions, although no indications about the reliability of these solutions are reported.…”

Section: Introductionmentioning

confidence: 99%

Contemporaneous extension and compression in the Northern Apennines from earthquake fault-plane solutions

Frepoli

Amato

1997

Geophysical Journal International

220

105

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S U M M A R YThe Northern Apenninic arc belongs to the deformation zones surrounding the Adriatic plate, which behaves as a rigid block. It is a NE-verging fold-and-thrust belt, which developed since the Miocene with the migration of an extensional-compressional pair. Previous seismological data are roughly in agreement with this deformation picture, although the outer compressional front was not clearly defined by the few available solutions. In this work we confirm the existence of two adjacent zones of contemporaneous extension and compression in the Northern Apennines, defining the extent of these two zones and their interim1 deformation better than was previously done. This is accomplished through the analysis of 125 new focal mechanisms of earthquakes (2.6 < Md < 4.8) recorded by the national network of the lstituto Nazionale di Geofisica in the period 1988-1995. The two deformation zones are clearly separated and lie very close to each other with a partial overlapping in the Emilian-Tuscan Apennines. Strikeslip events are scattered in most of the study area. Thrust-faulting earthquakes are located in the internal part of the most recently active thrust front (middle-upper Pleistocene). There is a general trend of the compressional P-axes of thrust-fault and strike-slip solutions to be perpendicular to the Apenninic direction in the external zone, while the tensional axes of the normal-fault and strike-slip solutions in the belt do not show a uniform orientation. However, clearly evident is the -ENE direction of extension in the peri-Tyrrhenian region, consistent with the direction of Shmln in the Quaternary volcanoes of this region inferred from borehole breakouts and microearthquake fault-plane solutions. We determined the orientation of the stress tensor in the two main deformation zones by inversion of the 125 fault-plane solutions determined in this study. We found that the external belt is characterized by NE-SW compression (ol horizontal, oriented N45"E), while a normal-faulting regime with o3 -E-W oriented is characteristic of the Umbria-Tuscany (back-arc) region.

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“…A marked erosional surface is present between these deposits and the mainly gravelly sediments of Sicilian age: moreover numerous evidences of synsedimentary extensional tectonics are found. Sicilian deposits, currently present up to about 10 km from the Adriatic Sea, show eastern dip: this is due partly to depositional conditions (clinostratigraphy) and partly to the tilting connected with vertical uplifting and the compressive tectonics which are still active along the Adriatic coast (Riguzzi et al 1989;Di Bucci et al 2003).…”

Section: Geological and Geomorphological Datamentioning

confidence: 99%

Pliocene –Pleistocene geomorphological evolution of the Adriatic side of Central Italy

Gentili¹,

Pambianchi²,

Aringoli³

et al. 2017

Geologica Carpathica

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This work is a significant contribution to knowledge of the Quaternary and pre-Quaternary morphogenesis of a wide sector of central Italy, from the Apennine chain to the Adriatic Sea. The goal is achieved through a careful analysis and interpretation of stratigraphic and tectonic data relating to marine and continental sediments and, mostly, through the study of relict limbs of ancient landscapes (erosional surfaces shaped by prevailing planation processes). The most important scientific datum is the definition of the time span in which the modelling of the oldest morphological element (the "summit relict surface") occurred: it started during Messinian in the westernmost portion and after a significant phase during middle-late Pliocene, ended in the early Pleistocene. During the middle and late Pleistocene, the rapid tectonic uplift of the area and the climate fluctuations favoured the deepening of the hydrographic network and the genesis of three orders of fluvial terraces, thus completing the fundamental features of the landscape. The subsequent Holocene evolution reshaped the minor elements, but not the basic ones.

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Study of the seismic sequence of Porto San Giorgio (Marche)–3 July 1987

Cited by 29 publications

References 7 publications

Rates of active compressional deformation in central Italy and Sicily: evaluation of the seismic budget

Rates of active compressional deformation in central Italy and Sicily: evaluation of the seismic budget

Contemporaneous extension and compression in the Northern Apennines from earthquake fault-plane solutions

Pliocene –Pleistocene geomorphological evolution of the Adriatic side of Central Italy

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