Resolving a velocity inversion at the geotechnical scale using the microtremor (passive seismic) survey method

2004 ◽  
Vol 2004 (1) ◽  
pp. 1-4
Author(s):  
James Roberts ◽  
Michael Asten
Keyword(s):  
Seismic Survey ◽  
Survey Method ◽  
Velocity Inversion ◽  
Passive Seismic

scholarly journals A Quantitative Assessment of the Annual Contribution of Platform Down Wearing to Beach Sediment Budget: Happisburgh, England, UK

2018 ◽  
Author(s):  
Andres Payo ◽  
Mike Walkden ◽  
Michael A. Ellis ◽  
Andrew Barkwith ◽  
David Favis-Mortlock ◽  
...  
Keyword(s):  
Sediment Budget ◽  
Seismic Survey ◽  
Survey Method ◽  
Coastal Protection ◽  
Volume Data ◽  
Beach Sediment ◽  
Passive Seismic ◽  
Order Of Magnitude ◽  
Modelling Environment ◽  
Sand And Gravel

Field and numerical investigations at Happisburgh, East coast of England, UK, sought to characterize beach thickness and determine geologic framework controls on coastal change. After a major failure of coastal protection infrastructure, removal of about 1 km of coastal defense along the otherwise protected cliffed coastline of Happisburgh triggered a period of rapid erosion over 20 years of ca. 140 m. Previous sensitivity studies suggested that that beach thickness plays a major role in coastal recession. These studies were limited, however, by a lack of beach volume data. In this study, we have integrated the insights gained from our understanding of the Quaternary geology of the area, a novel non-intrusive passive seismic survey method, and a 3D novel representation of the subsurface source and transportable material into a coastal modelling environment to explore the role of beach thickness on the back wearing and down wearing of the cliffs and consolidated platform, respectively. Results show that beach thickness is non-homogeneous along the study site: we estimate that the contribution to nearshore sediment budget via platform down wearing is of a similar order of magnitude as sediment lost from the beach and therefore non-negligible. We have provided a range of evidence to support the idea that the Happisburgh beach is a relatively thin layer perched on a sediment rich platform of sand and gravel. This conceptualization differs from previous publications, which assumes that the platform was mostly till and fine material. This has direct implication on the regional sediment management of along this coastline. The present study contributes to our understanding of a poorly known aspect of coastal sediment budgeting and outlines a quantitative approach that allows for simple integration of geological understanding for coastline evolution assessments worldwide.

scholarly journals A Quantitative Assessment of the Annual Contribution of Platform Downwearing to Beach Sediment Budget: Happisburgh, England, UK

2018 ◽  
Vol 6 (4) ◽  
pp. 113 ◽  
Author(s):  
Andres Payo ◽  
Mike Walkden ◽  
Michael Ellis ◽  
Andrew Barkwith ◽  
David Favis-Mortlock ◽  
...  
Keyword(s):  
Sediment Budget ◽  
Seismic Survey ◽  
Survey Method ◽  
Coastal Protection ◽  
Volume Data ◽  
Beach Sediment ◽  
Passive Seismic ◽  
Order Of Magnitude ◽  
Modelling Environment ◽  
Sand And Gravel

Field and numerical investigations at Happisburgh, East coast of England, UK, sought to characterize beach thickness and determine geologic framework controls on coastal change. After a major failure of coastal protection infrastructure, removal of about 1 km of coastal defence along the otherwise protected cliffed coastline of Happisburgh triggered a period of rapid erosion over 20 years of ca. 140 m. Previous sensitivity studies suggest that beach thickness plays a major role in coastal recession. These studies were limited, however, by a lack of beach volume data. In this study, we have integrated the insights gained from our understanding of the Quaternary geology of the area, a novel non-intrusive passive seismic survey method, and a 3D novel representation of the subsurface source and transportable material into a coastal modelling environment to explore the role of beach thickness on the back wearing and downwearing of the cliffs and consolidated platform, respectively. Results show that beach thickness is non-homogeneous along the study site: we estimate that the contribution to near-shore sediment budget via platform downwearing is of a similar order of magnitude as sediment lost from the beach and therefore non-negligible. We have provided a range of evidence to support the idea that the Happisburgh beach is a relatively thin layer perched on a sediment rich platform of sand and gravel. This conceptualization differs from previous publications, which assume that the platform was mostly till and fine material. This has direct implication on regional sediment management along this coastline. The present study contributes to our understanding of a poorly known aspect of coastal sediment budgeting and outlines a quantitative approach that allows for simple integration of geological understanding for coastline evolution assessments worldwide.

Seismic solutions utilizing existing in-mine infrastructure for mineral exploration: A case study from Maseve platinum mine, South Africa

2022 ◽  
Vol 41 (1) ◽  
pp. 54-61
Author(s):  
Moyagabo K. Rapetsoa ◽  
Musa S. D. Manzi ◽  
Mpofana Sihoyiya ◽  
Michael Westgate ◽  
Phumlani Kubeka ◽  
...  
Keyword(s):  
South Africa ◽  
Seismic Data ◽  
Mineral Exploration ◽  
Ground Surface ◽  
Seismic Survey ◽  
Noisy Environment ◽  
Borehole Data ◽  
Passive Seismic ◽  
Below Ground

We demonstrate the application of seismic methods using in-mine infrastructure such as exploration tunnels to image platinum deposits and geologic structures using different acquisition configurations. In 2020, seismic experiments were conducted underground at the Maseve platinum mine in the Bushveld Complex of South Africa. These seismic experiments were part of the Advanced Orebody Knowledge project titled “Developing technologies that will be used to obtain information ahead of the mine face.” In these experiments, we recorded active and passive seismic data using surface nodal arrays and an in-mine seismic land streamer. We focus on analyzing only the in-mine active seismic portion of the survey. The tunnel seismic survey consisted of seven 2D profiles in exploration tunnels, located approximately 550 m below ground surface and a few meters above known platinum deposits. A careful data-processing approach was adopted to enhance high-quality reflections and suppress infrastructure-generated noise. Despite challenges presented by the in-mine noisy environment, we successfully imaged the platinum deposits with the aid of borehole data and geologic models. The results open opportunities to adapt surface-based geophysical instruments to address challenging in-mine environments for mineral exploration.

Passive Seismic Survey for Cultural Heritage Landslide Risk Assessment

2013 ◽  
pp. 483-489 ◽  
Author(s):  
Daniele Spizzichino ◽  
Claudio Margottini ◽  
Silvia Castellaro ◽  
Francesco Mulargia
Keyword(s):  
Risk Assessment ◽  
Cultural Heritage ◽  
Seismic Survey ◽  
Landslide Risk ◽  
Landslide Risk Assessment ◽  
Passive Seismic

Analysis of Seismic Vulnerability - Case of Buildings of High Seismic Hazard

2014 ◽  
Vol 875-877 ◽  
pp. 416-422
Author(s):  
Abdelheq Guettiche ◽  
Mostefa Mimoune
Keyword(s):  
Seismic Risk ◽  
Seismic Vulnerability ◽  
Housing Stock ◽  
Earthquake Hazard ◽  
Seismic Survey ◽  
Survey Method ◽  
Earthquake Hazards ◽  
Physical Vulnerability ◽  
Seismic Safety ◽  
Moderate Seismicity

Seismic vulnerability of an urban environment is characterized by the ability of buildings and structures to support seismic events (physical vulnerability) and by the ability of people to behave in a consistent and rational face a major event (social vulnerability). Constantine is a city with moderate seismicity but the level of risk is high because of urban concentration and topography of the site. The seismic risk reduction therefore requires assessing the physical vulnerability of its buildings. It is proposed in this paper an analysis of a group of buildings for residential use located west of the city, consisting mainly of relatively high buildings. Following a survey of a portion of the housing stock of this city, a seismic survey method was applied based on "observations" post-seismic. Vulnerability indicators are statistically related to damage through a vulnerability index "IV" to establish curves of damage (or vulnerability). These are used to estimate the level of damage that is likely resulting in damage cards. The goal is to develop an initial database of some of the housing stock in the Constantine city (knowledge of earthquake hazards, construction defects ...) to be used in the estimation of seismic risk and verification of seismic safety of existing buildings. Keywords: Earthquake hazard; Seismic vulnerability; Constantine city; damage.

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