Attenuation from seismic refraction surveying as a ground investigation aid

Murphy, B. J.; Rosenbaum, M. S.

doi:10.1144/gsl.qjeg.1989.022.01.07

Cited by 2 publications

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“…The rise time method is flawed because of the source dependence of C. However, its great simplicity and generally impressive linearity in plotting results in many arbitrarily applying it e.g., Murphy and Rosenbaum (1989). Filtering of the data, as was required in this study obviously changes the rise time, however, Q derived from unfiltered data is also of dubious utility.…”

Section: Discussionmentioning

confidence: 97%

Measurement of seismic P- and S-wave attenuation in volcanic tuff, Rainier Mesa Tunnels, Nevada Test Site

Carroll¹

1994

Open-File Report

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Ground shock measurements resulting from a nuclear explosion in P tunnel at the Nevada Test Site indicate attenuation rates somewhat greater than observed for events detonated in other tunnels in the Rainier Mesa area. Because ground shock attenuation is a factor in containment mechanisms, prediction of this phenomenon is of some importance. Published studies indicate that the properties having most influence on ground shock attenuation gas voids and rock strength directly and indirectly affect elastic wave attenuation in a significant manner and to a greater extent than they do compressional-and shear-wave velocities. Therefore, attenuations of shear and compressional waves were measured at two sites in P tunnel and at one site in N tunnel to determine if differences in elastic wave attenuation exist between the two environments, and to evaluate the technique for its utility as a qualitative tool for estimating comparative ground-shock attenuation at proposed event sites.Spectral ratio, rise time, and time-domain amplitude techniques were used to reduce the data. The resulting values of Qp and Qs differ significantly between techniques. The data derived by the spectral ratio technique, considered most reliable, indicate greater attenuation at the P tunnel sites (Qp=18, Qs=18-23) than at N tunnel (Qp=23, Qs=35).Uncertainties in the effects of scattering and interference, particularly at the N tunnel site, indicate that additional measurements are necessary to support these results and to develop the best technique for determining Q in this environment.

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Section: Discussionmentioning

confidence: 97%

Measurement of seismic P- and S-wave attenuation in volcanic tuff, Rainier Mesa Tunnels, Nevada Test Site

Carroll¹

1994

Open-File Report

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“…This relates to ground classification and assessment for civil engineering, including survey of static properties or monitoring of dynamic processes in relation to geotechnical, geochemical, geomechanical or deformation behaviour associated with engineering activities in the subsurface and surface excavation. Seismic Refraction contributions include the novel application of spectral P-wave attenuation by Murphy & Rosenbaum (1989) for rock mass assessment of Devonian rocks, and the development of field seismographs with radio telecoms enabled Young et al (1985a,b) to produce an attenuation-based brokenness index of the shallow Coal Measures used to aid open cast coal dragline excavation planning. Also Hope et al (1999) used geophone measurements down two adjacent boreholes to overcome continual refraction of shear waves in poorly consolidated clays in Bothkennar, Scotland to produce shear wave velocity-depth profiles, reproduced in Figure 6.…”

Section: Engineering Applicationsmentioning

confidence: 99%

The geophysics contributions from the QJEGH , 1967 – 2015

Gunn

2017

QJEGH

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This paper reviews the geophysics contributions of the QJEGH (and forerunner QJEG) over the last 50 years in support of engineering geology, hydrogeology and ground engineering. It includes a brief history of some world and national influences on the ascent of geophysics over this time. The fundamental objectives behind geophysical surveying and monitoring are recapped before presenting contributions, across a range of geophysical methods, within a framework of applications, originally devised by the Geological Society Engineering Group Working Party for Engineering Geophysics in 1988. Three quarters of the papers reviewed focused on UK geology. Seismic, electrical resistivity and thermal methods accounted for 60% of the contributions, with magnetic, gravity and seismicity accounting for a further 24%. Some contributions are highlighted in each of the applications sections; these were considered exemplars of good practice, of good data, or considered by the reviewer to be innovative (at the time). Tables classifying around 140 papers into geophysical themes will enable practitioners to utilise the Geological Society Online Lyell Collection to review appropriate geological and hydrogeological contexts for successful engineering geophysical applications in support of future engineering. 1. Review Structure The Quarterly Journal of Engineering Geology (QJEG) was established to support the Engineering Group of the Geological Society, with its first publication in 1967. In 2000, the name of the Journal was changed to the Quarterly Journal of Engineering Geology and Hydrogeology (QJEGH), providing more explicit recognition of the significance of hydrogeology to ground engineering. This paper forms part of a series celebrating the journal's contribution across a range of relevant subject areas during its first 50 years of publication. The series commenced with an overview paper that set out the origins, history and status of the journal (Winter & Bromhead, 2016) before taking a very brief look at the future. Covered here are the geophysical contributions made by the journal from 1967 to 2015, which can be used in conjunction with other papers dealing with connected topics, such as the reviews on: terrain evaluation, mapping and geological models by Griffiths (2017), aggregates and earthworks and geomaterials by Cassar & Standing (2017). Ascent of Geophysics over the last Half-Century Much of today's geophysics practice, has in part, been shaped by significant global events during the period covered by this review. Many geophysical techniques ascended to address the survey and monitoring demands in support of UK and overseas development. In the 1960s, during the Decade of Development, the Dept. of Technical Cooperation supported much exploration geophysical activity to assist the economic development in Kenya, Uganda and Nigeria after their independence from colonial rule. Regional mapping and exploration over depositional basins, fold belts, intrusions and faulted structures also aided surveys for coal and hydrocarbons,...

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Attenuation from seismic refraction surveying as a ground investigation aid

Cited by 2 publications

References 14 publications

Measurement of seismic P- and S-wave attenuation in volcanic tuff, Rainier Mesa Tunnels, Nevada Test Site

Measurement of seismic P- and S-wave attenuation in volcanic tuff, Rainier Mesa Tunnels, Nevada Test Site

The geophysics contributions from the QJEGH , 1967 – 2015

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