Catálogo de publicaciones - revistas

<jats:p> Introduction to Water Resources and Environmental Issues, second edition, by Karrie Lynn Pennington and Thomas V. Cech, 2021. </jats:p>

<jats:p> Applications for Active membership have been received from the candidates listed herein. </jats:p>

<jats:p> The Meetings Calendar chronologically lists professional events of interest to SEG members and means by which further information can be obtained. </jats:p>

<jats:p> Cara Hunter and Teresa Santana discuss the value and importance of mentoring for geoscientists. They explain the need for Mentoring365, explore networking, and offer tips for first-time mentors and mentees. They also elaborate on the two-way aspect of mentorship and how any professional can build their network. The conversation concludes with a reflection on how mentorship has influenced their careers and the value of engaging as a mentor. </jats:p>

<jats:p> The Editorial Calendar details upcoming (approximately one year in advance) publication plans for The Leading Edge. This includes all special sections, guest editors, and information about submitting articles to TLE. </jats:p>

<jats:p> Your SEG is kicking off the new year with some exciting career development initiatives and collaborations with partner societies and supporting companies! </jats:p>

<jats:p> Technological advancements in geophysical sensors and sensor platforms over the past decade have given rise to the rapidly growing and innovative field of drone-based geophysics. As improvements in reliability, payload capacity, coverage capability, resolution, data quality, cost, and personnel safety continue to be realized, the widespread application of drone geophysics marks an exciting new era of innovation in near-surface geophysics. Since July 2017, when the first special section on drone geophysics was published in The Leading Edge, we have witnessed the rapid development and expansion of this applied-geophysics subfield to a point where there are now entire annual conferences, such as the SEG Summit on Drone Geophysics founded in 2020, dedicated to its continued advancement. Increasingly, it has become clear that drone geophysics is here to stay and is one of the most influential, widespread, and game-changing technology advancements in applied geophysics in recent years. </jats:p>

<jats:p> The Bjerkreim-Sokndal layered intrusion in Rogaland Anorthosite Province in southwestern Norway has been the focus of decades of research due to its complex geology, the presence of prominent remanent magnetic anomalies, and current economic interest in critical minerals. In 2021, collaborative geophysical fieldwork was conducted by the Norwegian University of Science and Technology and Helmholtz Institute Freiberg for Resource Technology. Despite challenging environmental conditions, more than 100 line-km of magnetic data were collected by a custom multirotor unmanned aerial vehicle (UAV) along the eastern margin of the Bjerkreim lobe of the Bjerkreim-Sokndal Intrusion. Data collection was focused over two areas. The first is an area in the south near the prominent Heskestad magnetic anomaly that is associated with large reversed magnetic remanence in a magnetite-ilmenite-gabbronorite unit. The second is an area in the north near Lake Teksevatnet that hosts mineralized zones and the Lauvneset magnetic anomaly. Initial analysis of the UAV-acquired magnetic data shows additional details on the geologic contacts of key units, especially where in-situ measurements are difficult to collect. UAV surveys help in the construction of an anomaly's geometry through incremental source-sensor separations at various flight altitudes above ground. The UAV data set is an intermediate step between ground and airborne surveys for multiscale interpretation and potentially extreme magnetic scales (from microscopic to planetary). </jats:p>

<jats:p> Across postconflict regions of the world, explosive ordnance (EO), which includes remnant antipersonnel land mines, antivehicle/tank mines, unexploded cluster munitions, improvised explosive devices, and explosive remnants of war (ERW) such as unexploded ordnance and abandoned explosive ordnance, remains a critical humanitarian concern. Clearance and land release efforts anchored on manual geophysical detection and mechanical probing methods remain painstakingly slow, expensive, and dangerous to operators. As a result, postconflict regions impacted by EO contamination significantly lag in social and economic development. Developing, calibrating, and field testing more efficient detection methods for surficial EO is a crucial task. Unpiloted aerial systems featuring advanced remote sensing capabilities are a key technology that may allow the tide to turn in the EO crisis. Specifically, recent advances in hardware design have allowed for effective deployment of small, light, and less power consuming hyperspectral imaging (HSI) systems from small unpiloted aerial vehicles (UAVs). Our proof-of-concept study employs UAV-based HSI to deliver a safer, faster, and more cost-efficient method of surface land mine and ERW detection compared to current ground-based detection methods. Our results indicate that analysis of HSI data sets can produce spectral profiles and derivative data products to distinguish multiple ERW and mine types in a variety of host environments. </jats:p>

<jats:p> Scalar magnetic surveying using unmanned aerial vehicle (UAV) platforms is slowly gaining momentum within geophysical applications. So far, only a handful of studies have dealt with UAV-towed scalar field measurements, while even fewer have considered towed scalar difference measurements (or gradients). In this paper, we demonstrate the possibilities and benefits of deploying precisely positioned noise-minimized UAV-towed scalar transverse horizontal difference (THD) measurements for mineral exploration purposes. UAV-towed gradiometry bird data are presented from the Nautanen area in northern Sweden and compared with ground magnetic surveys. This area is known for its iron oxide copper-gold mineralizations. The UAV survey spans a total area of 2.5 km<jats:sup>2</jats:sup>. It was covered using an average line spacing of 30 m and a constant flight altitude above ground level of 30 m. High-quality scalar total-field and THD data were collected with a dynamic noise level of the raw scalar data of about ±0.05 nT. Comparison with the ground magnetic data shows a strong correlation between magnetic anomaly lows and highs across the survey areas. A map with new structural information is presented based on subtle magnetic structures identified in discrete derivatives of the total magnetic intensity anomaly and THD data. Such systems may replace high-quality heliborne systems and reduce costs of the geophysical exploration phase. However, mapping with UAV-towed systems is not straightforward. With typical UAV flight speeds of only 10–12 m/s, the wind often disturbs the 3D attitude of the bird during flights. Hence, advanced processing is required to obtain the intended gradients. Similar challenges are less important in surveying, where the survey speed often greatly exceeds the wind speed. </jats:p>