Bent, A L; Voss, P. Geological synthesis of Baffin Island (Nunavut) and the Labrador-Baffin Seaway; by Dafoe, L T (ed.); Bingham-Koslowski, N (ed.); Geological Survey of Canada, Bulletin 608, 2022 p. 379-387, https://doi.org/10.4095/321857
<a href="https://geoscan.nrcan.gc.ca/images/geoscan/gid_321857.jpg"><img src="https://geoscan.nrcan.gc.ca/images/geoscan/gid_321857.jpg" title="Geological synthesis of Baffin Island (Nunavut) and the Labrador-Baffin Seaway; by Dafoe, L T (ed.); Bingham-Koslowski, N (ed.); Geological Survey of Canada, Bulletin 608, 2022 p. 379-387, https://doi.org/10.4095/321857" height="150" border="1" /></a>

A team of Cal Poly architectural engineering (ARCE) students placed second in the Earthquake Engineering Research Institute (EERI) Seismic Design Competition (SDC) in early March in San Diego.

An image by the Danish army shows the site after the landslide and subsequent mega-tsunami.

An image by the Danish army shows the site after the landslide and subsequent mega-tsunami.

The secrets of Saturn's veiled interior are leaking out by way of the planet's spectacular rings, according to a line of research that has taken four decades to come to fruition. In the last few years, what was first considered a sort of wacky hypothesis – that scientists can use Saturn’s rings to learn about  its structure -- has turned into a singular window into Saturn's surprisingly fluid and leviathan depths.

The post Sounding Saturn’s depths with its seismic icy rings appeared first on GeoSpace.

Federal procurement experts say applying the “rule of two” to all task order contracts is codification of the Tolliver decision by the Court of Federal Claims.

The post SBA initiates ‘seismic shift’ in small business contracting first appeared on Federal News Network.

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The announcement of the approval of five requests from companies to conduct seismic tests in the Atlantic Ocean could harm thousands of dolphins and whales, according to various international media reports. A story in the Los Angeles Times says, “The Trump administration is preparing to take an important step toward future oil and natural gas […]

A melting glacier caused a mountain in Greenland to collapse into a narrow fjord, setting off an oscillating wave that rattled seismic detectors around the world

The Republic of Armenia is located at the intersection of major tectonic faults, making it highly prone to seismic activity. The devastation of the 1988 Spitak earthquake claimed about 25,000 lives, including 6,000 school children; left 517,000 people homeless, destroyed 190 schools and many urban infrastructures; and incurred direct economic losses of $15 billion-$20 billion. The recent 7.8-magnitude earthquake in neighboring Trkiye and Syria in 2023 is a wake-up call for Armenia, posing a significant threat to the country. rkiye and Syria in 2023 is a wake-up call for Armenia, posing a significant threat to the country.

Explained: How coronavirus lockdown reduced Earth’s seismic noise levels  The Indian Express

UK sees notable reduction in seismic noise caused by human activity – experts  Aberdeen Evening Express

A new screening tool to assess the potential seismic risks (earthquake activity) from deep geothermal energy projects has been outlined in a recent study. The tool provides categories of seismicity risk for projects, which are dependent on factors including geological aspects, as well as social concern and location in relation to urban areas.

The survey was the first ever OBN seismic survey to be conducted in Egypt and the most detailed survey of the block since 1988.

Deep learning-based models, such as convolutional neural networks, have advanced various segments of computer vision. However, this technology is rarely applied to seismic shot gather noise localization problem. This letter presents an investigation on the effectiveness of a multi-scale feature-fusion-based network for seismic shot-gather noise localization. Herein, we describe the following: (1) the construction of a real-world dataset of seismic noise localization based on 6,500 seismograms; (2) a multi-scale feature-fusion-based detector that uses the MobileNet combined with the Feature Pyramid Net as the backbone; and (3) the Single Shot multi-box detector for box classification/regression. Additionally, we propose the use of the Focal Loss function that improves the detector's prediction accuracy. The proposed detector achieves an AP@0.5 of 78.67\% in our empirical evaluation.

An exemplary system for managing the deployment of a seismic data acquisition system uses a module configured to execute a plurality of task in the field by receiving one or more seismic devices. The module may include a power source that provides electrical power to the seismic devices. The module may also include a processor programmed to retrieve data stored in the seismic devices, perform diagnostics, facilitate inventory and logistics control, configure seismic devices and update data or pre-programmed instructions in the seismic device.

A method for determining position of a wellbore in the Earth's subsurface includes actuating a plurality of seismic energy sources each disposed at a known geodetic position. Seismic energy from the sources is detected at a selected location along the wellbore. The geodetic position at the selected location is determined from the detected seismic energy. A corresponding method includes actuating a seismic energy source at a selected position within the wellbore. The seismic energy is detected at a plurality of known geodetic positions. The geodetic position of the source is determined from the detected seismic energy.

A technique includes processing seismic data indicative of samples of at least one measured seismic signal in a processor-based machine to, in an iterative process, determine basis functions, which represent a constructed seismic signal. The technique includes in each iteration of the iterative process, selecting another basis function of the plurality of basis functions. The selecting includes based at least in part on the samples and a current version of the constructed seismic signal, determining a cost function; and interpreting the cost function based at least in part on a predicted energy distribution of the constructed seismic signal to select the basis function.

Measurement data is received from first and second seismic sensors, where the first and second seismic sensors are oriented in opposite directions. Each of the first and second seismic sensors has a sensing element responsive to pressure and particle motion. The signals can be combined to remove the particle motion component of the measurement data and obtain pressure-only data. Alternatively, the signals can be combined to deghost the received measurement data.

An intermediate support structure for an escalator or moving walk having a dampening device with slots formed therein allowing a supported escalator truss to be free to move laterally to accommodate lateral displacement caused by story drift during an earthquake or seismic event.

A biodegradable ground contact sleeve for a seismic data acquisition node includes a ground contact sleeve having a substantially tubular shaped body insertable into the surface of the earth and having an internal opening at one longitudinal end for receiving a seismic data acquisition node and making acoustic coupling thereto. The ground contact sleeve is formed of biodegradable material.

Acquiring seismic data using time-distributed sources and converting the acquired data into impulsive data using a multiple-frequency approach. The methods are performed in frequency-source location domain, frequency-wavenumber domain, or frequency-slowness domain. The methods are applicable to single source acquisition or simultaneous source acquisition.

The future of one of Australia's most profitable gold mines appears to be on shaky ground after more than 100 seismic events were recorded in a single day.

Oil and gas testing is set to take place in the Great Australian Bight this year, with the national petroleum regulator granting permission to exploration company PGS.

A plan to probe the Great Australian Bight for gas and oil using seismic testing is delayed, with the company behind the move confirming its testing will be postponed until next year.

Accelerated bridge construction (ABC) utilizes rigorous planning, new technologies, and improved methods to expedite construction. Prefabricated columns and their connections to adjoining bridge members (cap beams, footings, pile caps, and pile shafts) are the most critical components of ABC in moderate- and high-seismic regions. The TRB National Cooperative Highway Research Program's NCHRP Research Report 935: Proposed AASHTO Seismic Specifications for ABC Column Connections develops AASHTO specificatio...

Diane Rodriguez, ex-associate artistic director of Center Theatre Group, is remembered for her work with Luis Valdez and Culture Clash, among others.

"We investigate the potential of using high-resolution seismic methods for rock characterization and for targeting of gold deposits at the St. Ives gold camp. The application of seismic methods in hard-rock environments is challenged by complex structures, intrinsically low signal-to-noise ratio, regolith distortions, and access restrictions. If these issues can be addressed, then the unparalleled resolving power of reflection seismic can be used for mineral exploration. Appropriate spatial sampling of the wavefield combined with a survey geometry design and rigorous data processing to incorporate high fold and long offsets are necessary for creation of high-quality seismic images. In the hard-rock environment of Western Australia, accurate static corrections and multiphase velocity analysis are essential processing steps. This is followed by a rigorous quality control following each processing step. In such a case, we show that the role of reflection seismic could be lifted from mere identification of first-order structures to refined lithological analyses. Five deep boreholes with sonic logs and core sample test data wer eused to calibrate 2D seismic images. Despite seismic images were produced with relatively robust scaling it was possible to achieve reasonably high seismic-log correlation across three of the tightly spaced boreholes using a single composite wavelet. Amplitude-versus-offset (AVO) analysis indicated that gold-bearing structures may be related to elevated AVO effect and increased reflectivity. Consequently, partial stack analysis and acoustic and elastic inversions were conducted. These results and impedance crossplots were then evaluated against known gold occurrences. While still in the preliminary stages, hard-rock seismic imaging, inversion, and the application of AVO techniques indicated significant potential for targeting mineral reserves" -- Summary.

"Researchers of DETCRC 3.1 project acquired substantial experience in seismic exploration of Nickel deposits across Yilgarn craton, Western Australia. There are many lessons learnt and various approaches trialled. The validity of the research conducted and the outputs achieved were verified against real field data provided by the sponsors and affiliates to DET CRC. Research quality was scrutinised by publishing in high level journals. In general high quality images are achieved over nickel rich Kambalda province that allowed for an accurate structural interpretation. Rock identification and characterisation is still challenging particularly due to lack of calibration of seismic images with borehole logs and borehole seismic. Several case histories are documented and briefly analysed. The difference between Komatiitic nickel deposit of Australia and Canada is also commented in light of seismic response and required technology for its detection" -- Executive summary.

"This document is intended to summarise the current state, understanding and the use of seismic reflection method for mineral exploration. Its primary objective is to provide a point of reference, based on actual case studies, for mineral explorers interested in the application of seismic methods to their project. It provides summary information (including the purpose of the survey, acquisition methods, geometry and cost, processing procedures and key findings) that are intended to provide the reader with an objective means of assessing the cost effectiveness of the technique with respect to exploration objectives. It is also aimed at exchange of information between DETCRC sponsors, affiliates and researchers. Finally we hope that this table will help in shaping future research efforts and direction within Project 3.1, regarding the application of seismic for mineral exploration.This is only initial work and it is hoped that it will evolve into a document or a catalogue that will be extensively used by the mineral industry to achieve their exploration objectives in more efficient and effective way" -- Executive summary.

The report claims that the development could help seismologists detect earthquakes of even very small magnitude, signals of which were earlier drowned in the cacophony produced by various activities.

Pre-drill pore pressure prediction is essential for safe and efficient drilling, and is a key element in the risk-reducing toolbox when designing a well. On the Norwegian Continental Shelf, pore pressure prediction commonly relies on traditional 1D offset well analysis, whereas velocity data from seismic surveys are often not considered. Our work with seismic interval velocities shows that the velocity field can provide an important basis for pressure prediction and enable the construction of regional 3D pressure cubes. This may increase the confidence in the pore pressure models and aid the pre-drill geohazard screening process. We demonstrate how a 3D velocity field can be converted to a 3D pore pressure cube using reported pressures in offset wells as calibration points. The method is applied to a regional dataset at the Halten Terrace in the Norwegian Sea; an area with a complex pattern of pore pressure anomalies which traditionally has been difficult to predict. The algorithm is searching for a velocity to pore pressure transform that best matches the reported pressures. The 3D velocity field is a proxy of rock velocity and is derived from seismic surveys, and is verified to checkshot velocities and sonic data in the offset wells.

The authors present results of the first high-resolution deep seismic reflection survey in the Pieniny Klippen Belt (PKB) in Poland. This survey sheds new light on the matter of olistostromes and the mélange character of the PKB. The sedimentary mass-transport deposits represented by olistoliths and olistostromes manifest themselves by different petrophysical parameters of rocks (velocity, density and resistivity) and seismic attributes. Seismic attributes are very effective in the interpretation of the geology of complex mélanges. The authors used selected attributes: low-pass filter, energy, energy gradient, dip-steered median filter, Prewitt filter, Laplacian edge enhancing filter and square root of the energy gradient. These attributes emphasize changes of the seismic image inside mélange zones. The distinguished olistoliths are now inside imbricated thrust structures and they are tectonically rearranged. Polygenetic mélanges in the PKB originated as a result of sedimentary and tectonic processes. The PKB in the investigated area forms several north-vergent thrust sheets belonging to the Złatne and Hulina nappes. Both nappes contain large chaotic, non-reflective olistoliths as well as the smaller mainly high-reflective olistoliths. Olistoliths are arranged parallel to the flysch layering and thrusts. The results presented confirm the postulated two olistostrome belts within the PKB structure.

Thematic collection: This article is part of the Polygenetic mélanges collection available at: https://www.lyellcollection.org/cc/polygenetic-melanges

In 2015, the M_w 7.8 Gorkha earthquake struck Nepal, triggering thousands of landslides across the central and eastern Himalayas. These landslides had many adverse effects, including causing widespread damage to low-grade transport routes (e.g. tracks, footpaths) in rural regions that depend on tourism for survival. Langtang Valley is a glacial–periglacial landscape located 60 km north of Kathmandu. It is one of the most popular trekking regions in Nepal and has been severely affected by Gorkha earthquake-triggered and monsoon-triggered landsliding. Here, qualitative and quantitative observations from fieldwork and remote sensing are used to describe the materials and geomorphology of the landslides across Langtang Valley, and to quantify the extent to which coseismic and monsoon-triggered landslides have affected Langtang's trekking infrastructure. The dominant bedrock materials involved within Langtang landslides are found to be a range of gneisses and intruded leucogranites. In total, 64 landslides are found to have intersected trekking paths across Langtang, with coseismic and monsoon-triggered landslides having an impact on c. 3 km and 0.8 km of path respectively. It is observed that the practice of reconstructing paths through unstable landslide deposits is leaving the trekking infrastructure across Langtang increasingly vulnerable to future failure.

Singapore : Springer, c2019.

Seismic Design of Structures

Dewey Library - QE539.2.S34.C664 2019

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Hayden Library - QB812.B37 2017

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The National Institutes of Health’s largest loan repayment program was conceived to help scientists pay off school debts without relying on industry funding. But a close examination of the program by investigative correspondent Charles Piller has revealed that many participants are taking money from the government to repay their loans, while at the same time taking payments from pharmaceutical companies. Piller joins Host Sarah Crespi to talk about the steps he took to uncover this double dipping and why ethicists say this a conflict of interest.   Sarah also talks with Nate Lindsey, a Ph.D. candidate at the University of California, Berkeley, about turning a 50-kilometer undersea fiber optic cable designed to move data into a sensor for activity in the ocean and the land underneath. During a 4-day test in Monterey Bay, California, the cable detected earthquakes, faults, waves, and even ocean-going storms. For this month’s books segment, Kiki Sandford talks with Dan Hooper about his book At the Edge of Time: Exploring the Mysteries of Our Universe’s First Seconds.   You can find more books segments on the Books et al. blog.   This week’s episode was edited by Podigy.   Ads on this week’s show: McDonalds; Salk’s Where Cures Begin podcast   Download the transcript (PDF) Listen to previous podcasts.   About the Science Podcast

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