Comparison between reprocessed seismic profiles: Seismologic and geologic data — A case study of the Colfiorito earthquake area

Stucchi, E.; Mirabella, Francesco; Ciaccio, Maria Grazia

doi:10.1190/1.2187709

Cited by 4 publications

(7 citation statements)

References 37 publications

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“…Fluid filled and altered zones are incapable of supporting significant stress internally, representing a barrier to the migration of earthquakes toward the surface. Thus, the recovered model supports the hypothesis of a listric depth geometry of the fault also suggested in Stucchi et al (2006).…”

Section: Discussion and Concluding Remarkssupporting

confidence: 85%

“…The resistivity model, best fitting the data up to a period of 10 s, images, in its shallow part, alternating resistive and conductive zone well representing the typical thrust structure of the area described by Miller et al (2004), supported also by reflection seismic results (Stucchi et al, 2006). Resistive and conductive signatures of this structure can be respectively associated (see table I) to compact Maiolica Formation and the presence, within the thrust, of Marne a Fucoidi (Mirabella and Pucci, 2002).…”

Section: Discussion and Concluding Remarkssupporting

confidence: 61%

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Shallow to intermediate resistivity features of the Colfiorito Fault System inferred by DC and MT survey

Diaferia

Loddo

Schiavone

et al. 2009

Annals of Geophysics

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Over the last decade electromagnetic (EM) measurements have provided new constraints on the upper-crustal structure of the major fault zones in the world, both when they act as conduit and as a barrier, due to strong sensitivity of resistivity to fluids circulation and mineralization. On the track of a high impact magnetotelluric (MT) study performed across the San Andreas Fault, high resolution EM data were collected in the Colfiorito epicentral area along profiles crossing some main fault lineaments. Being the study focussed both on shallow that on intermediate resistivity distribution in the brittle upper-crust, a MT profile was integrated by several electrical resistivity tomographies (ERT). The latter were successful in locating faults even where the structures are buried by a wide covering of Quaternary deposits and in the recognition of different electrical signatures of the faults. MT resistivity model crossing Mt. Prefoglio normal fault clearly imaged the typical thrust structures of the area and a high conductive zone spatially related to the fault. Seismicity seems to be located outside such conductive area, whose behaviour suggests a fluidised and altered zone incapable of supporting significant stress internally.

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Section: Discussion and Concluding Remarkssupporting

confidence: 85%

Section: Discussion and Concluding Remarkssupporting

confidence: 61%

Shallow to intermediate resistivity features of the Colfiorito Fault System inferred by DC and MT survey

Diaferia

Loddo

Schiavone

et al. 2009

Annals of Geophysics

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show abstract

“…This is the case between Mt. Faeto and Colfiorito (see Figure 1b), where the section runs NW–SE along the normal fault's strike direction [ Stucchi et al , 2006]. At greater depths there is a high‐amplitude group of signals about 0.5 s thick, which image the top of the basement.…”

Section: Seismic Reflection Datamentioning

confidence: 99%

“…At depth, the continuity of the top of the basement reflector was significantly improved. A detailed description of the reprocessing procedure and its goals is given by Stucchi et al [2006].…”

Section: Seismic Reflection Datamentioning

confidence: 99%

Insights on the seismogenic layer thickness from the upper crust structure of the Umbria‐Marche Apennines (central Italy)

et al. 2008

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[1] We reconstruct the subsurface geology in a region of the northern Apennines (central Italy) where a protracted extensional sequence occurred in 1997-1998 with maximum magnitude M = 6.0. Our study is mainly based on the interpretation of three reprocessed seismic reflection profiles crossing the epicentral area, which constrain the subsurface geometry to a depth of about 12 km where most of the shallow seismicity occurs. Comparing the subsurface setting with accurately determined earthquake locations, we find that the seismicity is located entirely within the sedimentary cover and does not penetrate the underlying basement. This is explained by considering that the sedimentary cover is rather thick and composed of relatively strong lithologies (platform carbonates and evaporites), while the upper part of the basement consists of weak phyllites and siliciclastic rocks. This weak horizon is also evidenced by the low-Vp values measured in deep wells of the region. Its effect is to decouple the sedimentary cover from the crystalline basement, where only microseismicity occurs. Our study indicates that local structure and stratigraphy can significantly influence the distribution of seismicity within the upper crust, particularly in complex geological environments such as thrust-and-fold belts. Citation: Mirabella, F., M. Barchi, A. Lupattelli, E. Stucchi, and M. G. Ciaccio (2008), Insights on the seismogenic layer thickness from the upper crust

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“…3). The line was acquired with explosives and shows the subsurface structures to a depth of 3s (twt); b) Seismic line S6, the line was acquired with Vibroseis; c) reprocessed S12 seismic line (Stucchi et al, 2006). The original data were acquired with Vibroseis.…”

Section: Seismic Data In the Umbria-marche Apenninesmentioning

confidence: 99%

Seismic reflection data in the Umbria Marche Region: limits and capabilities to unravel the subsurface structure in a seismically active area

Mirabella

Barchi

Lupattelli

2009

Annals of Geophysics

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Before seismic data were made available, the subsurface setting of the Umbria-Marche area was mainly derived from the extrapolation of surface data and from models resulting from analogies with other mountain chains around the world. During the '90s industrial seismic data availability considerably increased, allowing the definition of new, previously unknown features. Beside the industrial seismic data availability, a deep crustal, near vertical seismic section trending E-W was acquired (CROP-03) across the Italian peninsula from the Tyrrhenian to the Adriatic coast. The subsurface data defined the compressional deformation style (thin-Vs thick-skinned) and the extensional deformation style. A set of east-dipping low-angle-normal faults, which dissect the previous compressional structures and which are the dominant features controlling the extension of the Apennines were recognised. The subsequent application of the seismic data interpretation to seismotectonic issues, defined in more detail the subsurface geometries of the active faults and the relationships between upper crust structure and seismicity.

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Comparison between reprocessed seismic profiles: Seismologic and geologic data — A case study of the Colfiorito earthquake area

Cited by 4 publications

References 37 publications

Shallow to intermediate resistivity features of the Colfiorito Fault System inferred by DC and MT survey

Shallow to intermediate resistivity features of the Colfiorito Fault System inferred by DC and MT survey

Insights on the seismogenic layer thickness from the upper crust structure of the Umbria‐Marche Apennines (central Italy)

Seismic reflection data in the Umbria Marche Region: limits and capabilities to unravel the subsurface structure in a seismically active area

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