Crustal architecture of central Victoria: results from the 2006 deep crustal reflection seismic survey

2011 ◽  
Vol 58 (2) ◽  
pp. 113-156 ◽  
Author(s):  
R. A. Cayley ◽  
R. J. Korsch ◽  
D. H. Moore ◽  
R. D. Costelloe ◽  
A. Nakamura ◽  
...  
Keyword(s):  
Seismic Survey ◽  
Reflection Seismic ◽  
Central Victoria ◽  
Crustal Reflection

Yathong Trough deep 2D reflection seismic survey - identifying major structures for the southern Cobar Basin, NSW

2016 ◽  
Vol 2016 (1) ◽  
pp. 1-4
Author(s):  
Rosemary Hegarty ◽  
Astrid Carlton ◽  
Karol Czarnota
Keyword(s):  
Seismic Survey ◽  
Reflection Seismic

Time-frequency analysis of deep crustal reflection seismic data using Wigner-Ville distributions

2001 ◽  
Vol 38 (7) ◽  
pp. 1027-1035 ◽  
Author(s):  
Kris Vasudevan ◽  
Frederick A Cook
Keyword(s):  
Frequency Analysis ◽  
Instantaneous Frequency ◽  
Seismic Data ◽  
Drill Hole ◽  
Lateral Variation ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Reflection Seismic ◽  
Instantaneous Frequencies ◽  
Crustal Reflection

One important component of deep crustal reflection seismic data in the absence of drill-hole data and surface-outcrop constraints is classifying and quantifying reflectivity patterns. One approach to this component uses a recently developed data-decomposition technique, seismic skeletonization. Skeletonized coherent events and their attributes are identified and stored in a relational database, allowing easy visualization and parameterization of the reflected wavefield. Because one useful attribute, the instantaneous frequency, is difficult to derive within the current framework of skeletonization, time–frequency analysis and a new method, empirical mode skeletonization, are used to derive it. Other attributes related to time–frequency analysis that can be derived from the methods can be used for shallow and deep reflection seismic interpretation and can supplement the seismic attributes accrued from seismic skeletonization. Bright reflections observed from below the sedimentary basin in the Southern Alberta Lithosphere Transect have recently been interpreted to be caused by highly reflective sills. Time–frequency analysis of one of these reflections shows the lateral variation of energy with instantaneous frequency for any given time and the lateral variation of energy with time for any instantaneous frequency. Results from empirical mode skeletonization for the same segment of data illustrate the differences in the instantaneous frequencies among the intrinsic modes of the data. Thus, time–frequency distribution of amplitude or energy for any signal may be a good indicator of compositional differences that can vary from one location to another.

3D seismic traveltime tomography imaging of the shallow subsurface at the C O2 SINK project site, Ketzin, Germany

Geophysics ◽  
2009 ◽  
Vol 74 (1) ◽  
pp. G1-G15 ◽  
Author(s):  
Sawasdee Yordkayhun ◽  
Ari Tryggvason ◽  
Ben Norden ◽  
Christopher Juhlin ◽  
Björn Bergman
Keyword(s):  
Velocity Structure ◽  
Velocity Model ◽  
Geological Structure ◽  
Seismic Survey ◽  
Storage Site ◽  
Near Surface ◽  
Shallow Subsurface ◽  
Traveltime Tomography ◽  
Reflection Seismic ◽  
Reflection Data

A 3D reflection seismic survey was performed in 2005 at the Ketzin carbon dioxide [Formula: see text] pilot geological-storage site (the [Formula: see text] project) near Berlin, Germany, to image the geological structure of the site to depths of about [Formula: see text]. Because of the acquisition geometry, frequency limitations of the source, and artefacts of the data processing, detailed structures shallower than about [Formula: see text] were unclear. To obtain structural images of the shallow subsurface, we applied 3D traveltime tomography to data near the top of the Ketzin anticline, where faulting is present. Understanding the shallow subsurface structure is important for long-term monitoring aspects of the project after [Formula: see text] has been injected into a saline aquifer at about [Formula: see text] depth. We used a 3D traveltime tomography algorithm based on a combination ofsolving for 3D velocity structure and static corrections in the inversion process to account for artefacts in the velocity structure because of smearing effects from the unconsolidated cover. The resulting velocity model shows low velocities of [Formula: see text] in the uppermost shallow subsurface of the study area. The velocity reaches about [Formula: see text] at a depth of [Formula: see text]. This coincides approximately with the boundary between Quaternary units, which contain the near-surface freshwater reservoir and the Tertiary clay aquitard. Correlation of tomographic images with a similarity attribute slice at [Formula: see text] (about [Formula: see text] depth) indicates that at least one east-west striking fault zone observed in the reflection data might extend into the Tertiary unit. The more detailed images of the shallow subsurface from this study provided valuable information on this potentially risky area.

scholarly journals Cetacean behavioral responses to noise exposure generated by seismic surveys: how to mitigate better?

2016 ◽  
Vol 59 (4) ◽  
Author(s):  
Clara Monaco ◽  
Jesús M. Ibáñez ◽  
Francisco Carrión ◽  
L. Mario Tringali
Keyword(s):  
Noise Exposure ◽  
Behavioral Responses ◽  
Seismic Survey ◽  
Seismic Exploration ◽  
Mitigation Measures ◽  
Seismic Surveys ◽  
Reflection Seismic ◽  
Joint Nature Conservation Committee ◽  
Air Gun ◽  
Southern Mediterranean

<p>Cetaceans use sound in many contexts, such as in social interactions, as well as to forage and to react in dangerous situations. Little information exists to describe how they respond physically and behaviorally to intense and long-term noise levels. Effects on cetaceans from seismic survey activities need to be understood in order to determine detailed acoustic exposure guidelines and to apply appropriated mitigation measures. This study examines direct behavioral responses of cetaceans in the southern Mediterranean Sea during seismic surveys with large airgun arrays (volume up to 5200 ci) used in the TOMO-ETNA active seismic experiment of summer 2014. Wide Angle Seismic and Multi-Channel Seismic surveys had carried out with refraction and reflection seismic methods, producing about 25,800 air-gun shots. Visual monitoring undertaken in the 26 daylights of seismic exploration adopted the protocol of the Joint Nature Conservation Committee. Data recorded were analyzed to examine effects on cetaceans. Sighting rates, distance and orientation from the airguns were compared for different volume categories of the airgun arrays. Results show that cetaceans can be disturbed by seismic survey activities, especially during particularly events. Here we propose many integrated actions to further mitigate this exposure and implications for management.</p>

Repeated megaturbidite deposition in Lake Crescent, Washington, USA, triggered by Holocene ruptures of the Lake Creek-Boundary Creek fault system

2019 ◽  
Vol 131 (11-12) ◽  
pp. 2039-2055 ◽  
Author(s):  
Elana L. Leithold ◽  
Karl W. Wegmann ◽  
Delwayne R. Bohnenstiehl ◽  
Catelyn N. Joyner ◽  
Audrianna F. Pollen
Keyword(s):  
Critical Infrastructure ◽  
Fault Scarp ◽  
Seismic Survey ◽  
Fault System ◽  
Olympic Peninsula ◽  
Reflection Seismic ◽  
The North ◽  
Dextral Shear ◽  
Western Washington ◽  
Late Pleistocene To Holocene

Abstract Lake Crescent, a 180-m-deep, glacially carved lake located on the Olympic Peninsula in western Washington, USA, overlies the Lake Creek-Boundary Creek fault zone, a system of structures with at least 56 km of late Pleistocene to Holocene surface rupture. Investigation of the lake’s sediment, including a reflection seismic survey and analysis of piston cores, reveals evidence that the fault beneath the lake has ruptured four times in the past ∼7200 years, producing unusually thick deposits termed megaturbidites. The earthquakes triggered rockslides that entered the lake and caused displacement waves (lake tsunamis) and seiches, most recently ca. 3.1 ka. Seismic reflection results from beneath the depth of core penetration reveal at least two older post-glacial ruptures that are likely to have similarly affected the lake. The stratigraphy of Lake Crescent provides insight into the behavior of a fault system that partially accommodates regional clockwise rotation and contraction of the northern Cascadia forearc through oblique dextral shear, and highlights the potential for disruption to critical infrastructure, transportation corridors, and industry on the North Olympic Peninsula during future surface-rupturing earthquakes. Our results illustrate the potential synergism between lacustrine paleoseismology and fault-scarp trench investigations. More precise dating of strong earthquake shaking afforded by continuous accumulation of lake sediment improves earthquake histories based on trenched fault scarp exposures, which are commonly poorly dated.

A new interpretation of geological structure of Tempoku Coal Field by crooked-line survey

1992 ◽  
Vol 23 (2) ◽  
pp. 241
Author(s):  
O. Nakano ◽  
M. Endo ◽  
E. Ishii ◽  
H. Watanabe
Keyword(s):  
Large Scale ◽  
Geological Structure ◽  
Seismic Survey ◽  
Coal Field ◽  
Coal Seams ◽  
Reflection Seismic ◽  
Line Method ◽  
Northern Island ◽  
New Interpretation ◽  
Seismic Lines

Tempoku Coal Field is located in the northern area of Japan's northern island, Hokkaido. Here the exploration target, the Soya Coal-Bearing Formation, is of Tertiary age overlying Cretaceous basement. The regional structure of the area is characterised by a series of synclines and anticlines trending north-northwest, with several reverse faults. A suite of surveys was carried out in 1991, in the Asajino area in the central part of the coal field. The study included drilling, vertical seismic profiling, and trenching, as well as a reflection seismic survey with the crooked-line method, which is the subject of this paper. The crooked-line method was adopted because of the mountainous terrain of the area. The seismic lines were laid out along existing tracks and valleys. The main geological structure of the area had long been considered to be a monotonous series of folds. However, the 1991 survey revealed a large-scale thrust-related structure in the main coal seams, which presented clear reflectors. Together with the data from other surveys, a reinterpretation of the structure of the Asajino area is proposed.

New geophysical and geological results in frontier basins along the southwest Australian continental margin

2009 ◽  
Vol 49 (2) ◽  
pp. 587
Author(s):  
Chris Nicholson ◽  
Edward Bowen ◽  
George Bernardel ◽  
Barry Bradshaw ◽  
Irina Borissova ◽  
...  
Keyword(s):  
Continental Margin ◽  
Seismic Data ◽  
Seismic Survey ◽  
Magnetic Data ◽  
Geological Samples ◽  
Potential Field Data ◽  
Swath Bathymetry ◽  
Reflection Seismic ◽  
Industry Standard ◽  
Areas Of Interest

Under the Australian Government’s Energy Security Program, Geoscience Australia is conducting a seismic survey and a marine reconnaissance survey to acquire new geophysical data and obtain geological samples in frontier basins along the southwest Australian continental margin. Specific areas of interest include the Mentelle Basin, northern Perth Basin, Wallaby Plateau and the southern Carnarvon Basin. The regional seismic survey will acquire 8,000–10,000 km of industry-standard 2D reflection seismic data using an 8 km solid streamer and a 12 second record length, together with gravity and magnetic data. These new geophysical datasets, together with over 7,000 km of reprocessed open-file seismic, will facilitate more detailed mapping of the regional geology, determination of total sediment thickness, interpretation of the nature and thickness of crust beneath the major depocentres, modelling of the tectonic evolution and an assessment of the petroleum prospectivity of frontier basins along the southwest margin. The overall scientific aim of the marine survey is to collect swath bathymetry, potential field data, geological samples and biophysical data. Together with the new seismic data, samples recovered from frontier basins will assist in understanding the geological setting and petroleum prospectivity of these little known areas. Preliminary results from both surveys will be presented for the first time at this conference.

Sign in / Sign up

Export Citation Format

Share Document