High-resolution seismic reflection profiles reveal fracture zones within a ‘homogeneous’ granite batholith

Mair, J. A.; Green, A. G.

doi:10.1038/294439a0

Cited by 49 publications

(23 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mair and Green, 1981;Treadway et al, 1988;Benson, 1989;Benson andMustoe, 1989, 1991;Miller et al, 1990;Shtivelman et al, 1998;Wang, 2002). Other techniques, such as the use of ground penetrating radar (e.g., Liner and Liner, 1997) or trapped waves (Shtivelman et al, 2005), are more recently also being used for mapping geological faults.…”

Section: Introductionmentioning

confidence: 97%

A geophysical study of the S. Marcos–Quarteira fault, Portugal

Carvalho

Torres

Rocha

et al. 2006

Journal of Applied Geophysics

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 97%

A geophysical study of the S. Marcos–Quarteira fault, Portugal

Carvalho

Torres

Rocha

et al. 2006

Journal of Applied Geophysics

View full text Add to dashboard Cite

“…The seismic reflection method is probably the most suited method for geological fault mapping and it has been applied to fault location and characterization several times (e.g., MAIR and GREEN, 1981;TREADWAY et al, 1988;BENSON, 1989;BENSON and MUSTOE, 1989;MILLER et al, 1990;BENSON and MUSTOE, 1991;SHTIVELMAN et al, 1998;WILLIAMS et al, 2001;WANG, 2002;HARRIS and JAMES, 2009). Other techniques, such as the use of ground penetrating radar (e.g., LINER and LINER, 1997) or trapped waves (SHTIVELMAN et al, 2005), have also been used for mapping geological faults.…”

Section: Introductionmentioning

confidence: 99%

A Geophysical Study of the Carcavai Fault Zone, Portugal

Carvalho

Ramalho

Dias

et al. 2011

Pure Appl. Geophys.

View full text Add to dashboard Cite

The Algarve province is located a few hundred kilometres north of the crossing of the E-W Eurasia-Africa plate boundary in an area of diffuse seismicity and broad deformation. It is characterised by a moderate seismicity, with some important historical and instrumental earthquakes causing loss of lives and significant material damages. The area is affected not only by plate boundary earthquakes but also by moderate to large events generated by local sources. The assessment of onshore local sources is, therefore, of vital importance for an evaluation of the regional seismic hazard. This paper discusses the application of geophysical data to the study of the Carcavai fault zone, an outcropping structure more than 20 km long which is seen to deform sediments of the Plio-Quaternary age. The location of some sectors of the fault zone, as well as the vertical offsets of the structure, are still to be confirmed. In order to estimate these and to study the geometry of the fault zone at depth, geophysical data were acquired together with new geological data. Where the location of the fault was less certain, EM and seismic reflection profiles with coarse spatial sampling were carried out. After the detailed location of the fault zone, seismic reflection profiles with a more dense spatial resolution were acquired. The integrated interpretation of the geological and geophysical data confirmed the presence of a large fault zone. The total fault length is still unknown as its extension offshore is still being studied. Together with estimated values of the throw obtained, this data set has improved understanding the seismic hazard in the area by providing more refined estimates of coseismic rupture, maximum expected earthquake and return periods.

show abstract

“…data processing, to image subsurface structures in the Precambrian shield (Hajnal and Stauffer, 1975;Noponen et al, 1979;Green and Mair, 1983; Barazangi and Brown, 1986). In general, the approach to detect and map shallow fracture zones includes high-resolution reflection profiling (Mair and Green, 1981;Green and Mair, 1983;Soonawala, 1984;Juhlin, 1990), multioffset VSP (Carswell and Moon, 1989;Juhlin et al, 1991), traveltime tomography (Wong et al, 1983), and diffraction tomography (Tura et al, 1992). LOCATION sonic logging data from the borehole URL-6.…”

Section: Introductionmentioning

confidence: 99%

Imaging of reflection seismic energy for mapping shallow fracture zones in crystalline rocks

et al. 1994

View full text Add to dashboard Cite

The high-resolution reflection seismic technique is being used increasingly to address geologic exploration and engineering problems. There are, however, a number of problems in applying reflection seismic techniques in a crystalline rock environment. The reflection seismic data collected over a fractured crystalline rock environment are often characterized by low signal-to-noise ratios (SIN) and inconsistent reflection events. Thus it is important to develop data processing strategies and correlation schemes for the imaging of fracture zones in crystalline rocks. Two sets of very low SIN, high-resolution seismic data, previously collected by two different contractors in Pinawa, Canada, and the island of Aspo, Sweden, were reprocessed and analyzed, with special emphasis on the shallow reflection events occurring at depths as shallow as 60--100 m.The processing strategy included enhancing the signals hidden behind large-amplitude noise, including clipped ground roll. The pre-and poststack processing includes shot f-k filtering, residual statics, careful muting after NMO correction, energy balance, and coherency filtering. The final processed seismic sec-

show abstract

High-resolution seismic reflection profiles reveal fracture zones within a ‘homogeneous’ granite batholith

Cited by 49 publications

References 3 publications

A geophysical study of the S. Marcos–Quarteira fault, Portugal

A geophysical study of the S. Marcos–Quarteira fault, Portugal

A Geophysical Study of the Carcavai Fault Zone, Portugal

Imaging of reflection seismic energy for mapping shallow fracture zones in crystalline rocks

Contact Info

Product

Resources

About