Daniel Trugman

Earthquake early warning systems can provide crucial warning that strong ground shaking is imminent in the event of a large earthquake. In our recent open-access paper, @nvseismolab.bsky.social scientists study the potential for earthquake early warning systems in Nevada.

doi.org/10.1785/0120...

An important problem in seismology is to use the spatial "radiation" pattern of earthquake ground motion to infer fault plane geometry. This new study develops and systematically tests different ways of using S/P amplitude ratio data to more accurately infer focal mechanisms. doi.org/10.1785/0220...

Happy to share newly published work by recent @nvseismolab.bsky.social alum Avi Chatterjee developing machine learning workflows to characterize small earthquakes and the associated crustal stress field in southern Nevada: doi.org/10.1785/0220...

Accurately measuring earthquake size is one of the most important tasks in seismology, but is surprisingly difficult for small earthquakes. NSL PhD student Annie Patton used seismic coda - the extended ringing / shaking after direct phase arrivals - to measure sizes of small earthquakes in NV.

Most seismologists I work with use the term "absolute earthquake location" to refer to the position of the event in geographic coordinates and to distinguish this from "relative earthquake location" in relation to other nearby events. Not to imply "correct" or "accurate" by the word absolute...

A shaky day for us here in Nevada with a M5.5 earthquake NNE of Yearington at 3:08pm. Did you feel the shaking? Report it here earthquake.usgs.gov/earthquakes/...

Congrats, Avi!!! You made us all proud, and me especially!

Associate Professor / Director, Great Basin Center for Geothermal Energy The University of Nevada, Reno (UNR) appreciates your interest in employment at our growing institution. We want your application process to go smoothly and quickly. Final applications must be submitt...

Come join our geoscience group at University of Nevada Reno! We have a new faculty opening for the Director of the Great Basin Center for Geothermal Energy. More details below. UNR is an awesome place to live and work! nshe.wd1.myworkdayjobs.com/UNR-external...

I'm recruiting a new PhD student to work on landscape evolution following volcanic eruptions and the evolution of ridgelines. Please help spread the word. More info at: joelscheingross.com/opportunities/

Despite its importance, earthquake magnitude is a surprisingly ambiguous concept. Here we combine analysis of a large dataset of earthquakes in the western US with synthetic experiments to understand the relation between different magnitude scales. pubs.geoscienceworld.org/ssa/tsr/arti...

The catalog itself is here, and I can DM you the .pdf. zenodo.org/records/1116...

Locating earthquakes is a fundamental task in seismology with many important applications, but is not always as easy as it looks. Here we @nvseismolab.bsky.social published a new catalog of high-precision earthquake locations for Nevada and the surrounding region. doi.org/10.1785/0220...

High‐Frequency Ground Motions of Earthquakes Correlate With Fault Network Complexity <em>Geophysical Research Letters</em> is an AGU journal publishing high-impact, innovative articles on major advances spanning all of the major geoscience disciplines.

Very proud of my PhD student Avigyan Chatterjee's work characterizing spatial variations in earthquake ground motion in California. Someone hire this man! agupubs.onlinelibrary.wiley.com/doi/10.1029/...

Nature article proposes new way to identify faults that might pose earthquake risk | University of Nevada, Reno The researchers found geometric complexity of nearby faults could play a role in the risk of earthquakes

Nice writeup by UNR College of Science reporter Michelle Werdann on the relation between fault complexity and slip behavior in California
www.unr.edu/nevada-today...

Fault-network geometry influences earthquake frictional behaviour - Nature Analysis of some of the main fault zones in California shows that the presence of complex earthquake fault-network geometries results in geometric locking that promotes stick-slip behaviour, whereas s...

Neat work led by Brown Univ. PhD student Jaeseok Lee looking at the relation between fault creep and the geometric complexity of fault networks. This collaborative work with @nvseismolab.bsky.social scientists was published in Nature today: www.nature.com/articles/s41...

5 graduate students pose outside.

We are so proud of our NSL graduate students for all they've accomplished this year. One masters defense, three major grad schools exams passed, several conference presentations, and an upcoming paper in the journal Nature!

Last day in Alaska. Matanuska glacier.

Highlights of the SSA Field Trip cruise of Prince William Sound

Beautiful morning in Alaska, view of Denali from near Byers Lake.

We are hiring a new postdoctoral researcher at the NSL to help lead a NASA-funded project that aims to optimally combine large-scale, geodetic and seismic data to better understand earthquake processes along the California-Nevada border. See full job details here: www.linkedin.com/jobs/view/38...

Looking south from a backcountry ski tour near Tamarack Peak. Neat inversion over Lake Tahoe.

Mini powder day back home in the 505. First tour of the year; fitness is not quite there yet but still fun!

Yeah! I've heard reports of localized areas of low (as well as very high) ground motions from the 2023 event. It seems plausible for a single earthquake, but the curious thing about these rocks is that they have lived through many events. While they are only "semi-precarious", it is still a puzzle.

Right, exactly, possibly all three at once. There may be a general issue with the ground motion model used, a local issue with the particular source-site path the seismic waves traverse, and/or an issue with quantifying the fragility of those particular rocks.

Interesting thought; in this case the most likely cause of the discrepancy is not due to the rate of large earthquakes but rather the intensity of ground motion caused by those earthquakes. It is also quite possible that these rocks are less fragile than they appear for reasons we don't understand.

Nice article in Science about how studying naturally occurring, precariously balanced rocks can help improve seismic hazard maps.

www.science.org/content/arti...

I am co-conveneing this session! My first shot on convening a session so, submit your abstract and lets hang and talk science!

Perfectly precarious positions | University of Nevada, Reno Rocks that naturally lay in precarious positions remained upright during an earthquake, surprising seismologists

Great write-up by Michelle Werdann and the UNR College of Science team on our recent study of precariously balanced rocks that remained upright during a large earthquake: bit.ly/3uubiEN

New paper with Prof. Ben-Zion (USC/SCEC) that illuminates consistent trends in the activity of earthquake sequences in California and Nevada, and uses machine learning to uncover some possible driving factors. Read it open access at TSR! pubs.geoscienceworld.org/ssa/tsr/arti...

Really excited to share our latest work at the NSL focusing on a fascinating earthquake swarm in northwest Nevada. Kudos to the ace team at @weareseismica.bsky.social for helping getting this published and open to read in the broader community!