J. Andres Chavarria’s Post

Dark communications fibers offer fascinating possibilities for very dense geophysical imaging. In the 'South Island Seismology at the Speed of Light Experiment' (SISSLE), we have been using one such cable to image the Alpine Fault and detect and locate earthquakes near Haast, in South Westland, New Zealand. Meghan S. Miller, Voonhui Lai and I have just published a paper in Seismological Research Letters describing SISSLE and some of our preliminary observations; the link is posted in the comments. Fundamental and applied #geoscience led by The Australian National University and Victoria University of Wellington with the support of AuScope, Chorus NZ Limited, Australian Research Council, Natural Hazards Commission Toka Tū Ake, and the Haast community.

We are pleased to announce the session "S08 Recent Advances and Challenges in Environmental Seismology", which will take place during the IAGA/IASPEI Joint Meeting, to be held in Lisbon, Portugal, from August 31 to September 5, 2025. Over the last few years, environmental seismology has emerged as a key field in understanding natural hazards and climate change. By leveraging seismic technologies, we can gain crucial insights into the dynamics of the Earth’s systems and develop effective strategies to monitor and mitigate environmental challenges. This session invites contributions on environmental and non-impulsive seismic phenomena, as well as innovative data processing and analysis methods applied to volcanic eruptions, environmental landslides, groundwater dynamics, geothermal fields, the safety of geological CO2 storage sites, and tailings, among others. Contributions from researchers in related fields, such as geology, hydrology, hydrogeodesy, geotechnical engineering, and environmental science, are particularly encouraged, as interdisciplinary collaboration is essential for addressing these complex issues. For more information and registration, please visit the conference website: https://lnkd.in/dgeMs7ZJ #EnvironmentalSeismology #IAGA2025 #IASPEI2025 #EarthSciences

Low-frequency earthquakes aren't much to look at (and they're hard to find), but they serve as essential seismological probes of deep-seated faulting. In this case, the low-frequency earthquakes reveal otherwise undetectable slow slip in the Hikurangi Subduction Zone, about 50 km beneath the Kaimanawa Ranges. https://lnkd.in/gG2yb2fM It's wonderful to see this collaboration between Massachusetts Institute of Technology, GNS Science, and Victoria University of Wellington, spear-headed by William Frank and Florent Aden, come to fruition, the culmination of a project that first started with a Catalyst (Seeding) grant from the Royal Society Te Apārangi. #seismology #geodesy #subduction #nzscience

🌍 Happy to share our latest publication in Geophysical Research Letters! This research, conducted with my amazing colleagues Adriano Gualandi, Davide Faranda, and Gianmarco Mengaldo, investigates the world of #slow #earthquakes and how they behave. In our study, we compared real-world data from the Cascadia subduction zone with numerical simulations to see how well they mimic the actual slow earthquakes. We used some advanced tools from nonlinear dynamical systems to do this. Here are a few key takeaways from our work: • We found that real-world slow earthquakes and our simulations share some fundamental dynamical properties. • However, real-world earthquakes are more complex than what our simulations can currently capture, which means there's still a lot to learn. • By looking at instantaneous dynamical properties, like the instantaneous dimension and the extremal index, we can better understand and hopefully reduce the gaps between what we observe in nature and what we simulate. This research is a step forward in accurately modeling slow earthquakes, and we're excited about the potential of the metrics we developed to help in future studies. Thanks for your interest and support! Read the full paper here: https://lnkd.in/dcSAuGK2 Nanyang Technological University Singapore NTU Asian School of the Environment Earth Observatory of Singapore

Do you work in CCS but you don’t have a background in Geology? This course might be of interest for you. This fieldwork will show you examples of the structures we can find in subsurface and that we can use as reservoirs. You will learn about the dimensions of the systems and heterogeneities at different scales.

Excited to share a highlight from #ArcticChange2024! Today, I had the privilege of presenting my research on comparing Electrical Resistivity Tomography (ERT) and Spectral Induced Polarization (SIP) for detecting ground ice. Here’s a quick recap of the key takeaways: 1️⃣ SIP provides a clearer image of ground ice distribution. 2️⃣ It helps differentiate frozen clay from other conductive materials. 3️⃣ For highly resistive materials like bedrock, where ground ice overlaps in electrical resistivity, relaxation time (from SIP) is the game-changer. A huge thank you to Stephan Gruber for his guidance and to Derek Cronmiller for supporting the fieldwork. Special thanks to NSERC PermafrostNet and Yukon Geological Survey for funding this research. 🎯 If you'd like a copy of my presentation slides, feel free to message me—happy to share! #GroundIceDetection #Geophysics #PermafrostResearch #SIP #ERT #ArcticResearch Carleton University

🌍 Exciting News from the Arctic! ❄️ 📰 Stay in the SIG-nal! 🚢 We’re thrilled to share that our SIG PULSE L5 2000 Joules system is now being used for the first time on the icebreaker Oden 🚢, currently on an expedition in North Greenland. This groundbreaking project, led by the brilliant team from Stockholms universitet, is pushing the boundaries of geophysical research in one of the most challenging environments on Earth. Martin Jakobsson, Co-Chief Scientist of the expedition and professor of marine geology and geophysics, shared his thoughts on the mission: “We have used the system a couple of times, very difficult to find the right conditions as we are in the most heavily ice-infested areas in the Arctic, North Greenland. But there have been some open patches along land. First, we collected data in Newman Bay, Northern Nares Strait. It worked well, but the bottom geology for a sparker is very tough, hard till bottom, very little sediment, and huge topographic changes.” Their work involves geological mapping 🗺️, rock sampling, and imaging deep crustal structures to better understand the geological evolution of the region and its impact on glacial processes. At SIG, we are proud to support this critical research with our cutting-edge instruments, helping to unlock the secrets of the Earth’s most remote frontiers. 🌐 📸 Photo by: Björn Eriksson #GeophysicalInstruments #MarineGeophysics #ScientificResearch #SIGFRANCE

As an island nation, New Zealand has a vested interest in detecting earthquakes and tsunamis. And that makes the first project between the UK and New Zealand as part of a collaborative science, innovation, and technology agreement extremely relevant for the South Pacific. The UK’s National Physical Laboratory (NPL) and the Measurement Standards Laboratory of New Zealand are exploring the potential of quantum sensing technologies for sea floor cable-based environmental detection. The project will test whether existing seafloor fibre optic cables can be used for earthquake detection. The collaboration has real-world benefits for geophysics and tsunami detection, giving coastal communities in the South Pacific potentially life-saving early warnings. It will also align with the newly established the New Zealand Quantum Technology Research Programme. https://lnkd.in/gyee_fuH   Quantum technologies is 1 of 5 priority areas identified by the work programme which was recently signed by representatives from MBIE and the UK’s Department for Science, Innovation and Technology.   Find out about the work programme which follows the 2022 Research, Science, and Innovation Cooperation Arrangement that outlines a framework and focus for the bilateral relationship following the UK’s departure from the European Union. https://lnkd.in/gWJCP5-e

Is there any evidence of Slow Slip Events in the southern Peru-northern Chile subduction zone? Yes, Jara et al. find tiny events hidden in the geodetic noise. Read more to see how they detected and characterized them: https://lnkd.in/eQHmidxP Earthquakes correspond to a sudden release of elastic energy stored in the crust as a response to the relative motion of tectonic plates. However, this release of energy is not always sudden and accompanied by destructive seismic waves. It sometimes happens slowly during aseismic, Slow Slip Events (SSEs). It has been shown that SSEs can be associated with the nucleation, propagation, and termination of big earthquakes. SSEs have been detected along many subduction zones but not yet in northern Chile. Here, Jara et al. use a template matching method to scan GNSS observations of ground motion to detect and characterize slow slip events along the southern Peru - northern Chile subduction zone. They find 24 aseismic events at depths comparable with that of SSEs in other subduction zones, as well as in regions that persistently slip aseismically. Jara et al. examine how their findings relate to past earthquake ruptures, the geometry of the subduction zone, and fluids circulating at depth. Their results show the importance of implementing methods to extract small aseismic signals in noisy data, which are crucial observations for a better understanding of fault mechanics. #Chile #Peru #Seismology #EarthquakeScience #SubductionZone #SlowSlip  #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience

📢 Upcoming #LIAG #seminar: Join us on December 10, 2024, at 11:00 AM, as Lorena Bello presents her research work: "3D Seismic Morphology of a Channel-Floodplain System – New Interpretation Routine for Geothermal Prospects Aided by Attribute Analysis and Unsupervised Machine Learning." 🌟 This pilot #study investigates the seismic morphology of the Rhaetian fluvial distributive system (#RFDS), a key geothermal target in the North German Basin. Seismic amplitude, seismic attributes, and machine learning techniques, including principal component analysis (#PCA) and self-organizing maps (#SOM), were applied to generate seismic facies maps of the channel-floodplain system to improve the targeting of sandstone reservoirs for #geothermal #exploration. 🔗 See you via Webex or at Stilleweg 2, 30655 Hannover: https://lnkd.in/eY3yG3GW #GeothermalEnergy #Geothermics #Geophysics #Geoscience #Geophysik #Seismic #MachineLearning #Sustainability #Energy #Webinar #Norddeutschland