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EARTHQUAKE GEOLOGY in This Issue: Mike Oskin: #Earthquake Geology in Napa Valley Department News in Memoriam: Rand Schaal CHAIR’S WELCOME

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EARTHQUAKE GEOLOGY in This Issue: Mike Oskin: #Earthquake Geology in Napa Valley Department News in Memoriam: Rand Schaal CHAIR’S WELCOME 2015 -2016 NEWSLETTER VOLUME 12 #EARTHQUAKE GEOLOGY in this issue: Mike Oskin: #Earthquake Geology in Napa Valley Department News In Memoriam: Rand Schaal CHAIR’S WELCOME Dear Friends, Alumni, and Colleagues, on the cover: Napa Earthquake The Department of Earth and Planetary surface rupture moletrack through Sciences is continuing to thrive and vineyard property adjacent to build on its reputation for research Buhman road. and teaching excellence. UC Davis is ranked as having the highest impact of any university in life and earth sciences when both research output and quality are evaluated (http://dateline.ucdavis.edu/ dl_detail.lasso?id=15201&dn=060915). In addition, our graduate program remains very highly ranked, and excellent students are choosing to study in our Sarah Roeske in the Alaska Range. department. Our Geology, Natural Sciences, and Marine and Coastal Another major shift in our research Science majors remain strong and are program is a “change of hats” by continuing to grow. Dr. Sarah Roeske. Sarah helped run and managed the Electron Microprobe Lab for 25 years, and she decided to I am very pleased to announce that retire from her staff position in 2015. Professor Nicholas Pinter has joined the She will remain active in research and Earth and Planetary Sciences faculty teaching within Earth and Planetary as the new Roy J. Shlemon Chair in Sciences, but we will be hiring a new Applied Geosciences. Nicholas is an scientist to manage the probe lab. We expert in rivers and floodplains, with greatly appreciate Sarah’s decades a background in geomorphology. His of service to the department and the research spans policy development for UC Davis broader community in maintaining an floodplain land use to river flow history Earth and Planetary Sciences exceptionally high quality analytical and evolution to geomorphic signatures Newsletter, Volume 12 facility that is a pleasure to use. of Quaternary geological processes. And very importantly for our students, he is Table of Contents continuing the Ecogeomorphology of The UC-wide CalTeach/Math and page 2 Chair’s Welcome Rivers and Streams course that Professor Science Teaching (MAST) program page 4 #Earthquake Geology in Napa Jeff Mount supported with funds from remains under Earth and Planetary Valley the Shlemon Chair, providing students Sciences leadership with Professor page 6 Faculty News with intensive, multi-disciplinary Sandy Carlson taking over as faculty page 10 In Memoriam: Rand Schaal fieldwork opportunities on ecologically director after Professor Howard Day important rivers. retired last year. We are also very excited page 11 CalTeach/MAST to have a new science education leader join MAST: Susann Pinter. Susann contact us at: comes to MAST with extensive teaching, Department of Earth and Planetary Sciences teacher training, and pedagogical University of California, Davis experience that complements the skills One Shields Avenue of Mary Betty Stevenson, who built the Davis, CA 95616 program with Howard over the past 5 years. Based on the outstanding success phone: (530) 752-0350 of MAST, the addition of Susann to the email: [email protected] staff, and the desperate need for K-12 science teachers, we are hoping to raise web: http://geology.ucdavis.edu Nicholas Pinter. His research focuses on earth- surface processes (geomorphology) applied to significant foundation funds to allow facebook: search for “Geology at UC Davis” a broad range of problems. the MAST program to expand over the next several years. 2 Congratulations to the Class of 2015 As you will read in the rest of the appreciate the ability to expand student Cheers, newsletter, Earth and Planetary Sciences participation in these activities through researchers and students are performing enhanced financial support. exciting, state-of-the-art research Dawn Sumner spanning the globe. We provide both graduate and undergraduate students Finally, I wish to thank each of you with special research opportunities in who have contributed to our successes the field and in the lab, opportunities by participating in our community that prepare them for diverse careers. and representing our department as If you would like to help support these you have moved on to the next phases opportunities, please consider giving in your careers. Please come by when (https://give.ucdavis.edu/GELA) to the Cordell you are in the neighborhood and send Durrell Fund, the Rand Schaal Field updates on your activities to [email protected] Fund, or the Robert Matthews Memorial . Also, keep an eye out Endowment. These funds are used for at least two special alumni-focused exclusively to support student research events this year! We have some exciting and field experiences, and we greatly new plans developing.... 3 #Earthquake Geology in Napa Valley “The culprit for the 2014 South Napa earthquake was the West Napa fault. As we later discovered, this is not the first time that this fault has damaged the wine industry.” – Mike Oskin Featured Faculty Mike Oskin northwest, parallel to strike-slip faults and an alignment of low-amplitude of the right-lateral San Andreas system. hills occupied the center of the valley, Much of the topography of California The West Napa fault is likewise right- adjacent to the Napa River. Follow-up is related, in one way or another, to lateral, and it sits at the base of the mapping by UC Davis undergraduate active tectonics. In my research, I try to Mayacamas mountains, west of the Savannah Lisle, and field trips in March understand the evolution of topography city of Napa. Is there a component of of 2014, confirmed that the topographic in order to determine recent geologic uplift responsible for these mountains? benches were produced by repeated history, deduce patterns of uplift, and Oddly, the West Napa fault was mapped slip events on a reverse fault, and that measure rates of fault slip. This project as terminating about started out from a casual interest in halfway up the valley. earthquake hazards to our local, world- What happens north of this famous slice of wine country. The termination? Geophysical project accelerated after the 22 August data suggests a steep 2014 M6.0 South Napa earthquake boundary on the western focused attention on this problem. What side of the basin here, follows is the story of how but does not elucidate its UC Davis students, Dr. Louise Kellogg origin. and I discovered evidence that active faulting occurs along the entire length of Napa Valley, and that the size and extent I began my research by of potential earthquakes here has been poring over a 2003 lidar underestimated. I also describe some of survey that was collected the ways that 3-D visualization, and in for analysis of fish habitat particular the UC Davis KeckCAVES, in Napa Valley. Using has helped us in making this and the dynamic hillshading other discoveries following the 2014 feature of the KeckCAVES earthquake. LidarViewer point-cloud visualization software, I discovered a pair of subtle The culprit for the 2014 South Napa topographic features in earthquake was the West Napa fault. the northern part of the As we later discovered, this is not the valley, between St. Helena first time that this fault has damaged and Calistoga, that looked the wine industry: the M5.0 2000 suspicious: a set of narrow Yountville Earthquake likely occurred topographic benches lined along the same structure. Like other the southwest margin of valleys of the northern coast ranges, Simplifed map of the West Napa Fault, 2014 earthquake surface the valley, at the base of Napa Valley is elongated to the rupture, and aftershocks from 2000 and 2014 events. the Mayacamas mountains, 4 the hills were comprised of folded river gravel deposits. That May I submitted a proposal to the U.S. Geological Survey to study these features. This proposal would seem prescient a few months later. I was not in Davis on August 22, the morning of the South Napa earthquake. In southern California, visiting family, I would learn of the event about 5 hours later. The existence of surface rupture was not yet confirmed, so I immediately began to scour the web for reports of road damage, and Twitter for photographs. These revealed right- lateral offset of Highway 121/12, west Rupture across South Avenue and adjacent vineyard. Grad student Chad Trexler for scale. of Napa, coincident with one strand of the West Napa fault. So I broadcast strike of the rupture. As the extent published in Seismological Research an email to the UC Davis structural of faulting became clear, I also began Letters in May 2015. geology group to offer my field vehicle broadcasting our findings on Twitter. for earthquake field response. Alex By the end of the day, news media Morelan and Chad Trexler jumped on Nine UC Davis graduate students nationwide was following our feed for the opportunity and headed to the field participated in a follow-up special the latest information on the earthquake later that morning. studies course co-taught by Dr. Louise rupture. This team approach, with one Kellogg and I. The entire class mapped member working remotely, turned out the northern part of the fault in the field Alex, Chad, and I worked together as to be a highly effective way to cover where it is expressed in Bothe-Napa a team that day, communicating by ground quickly and make key, early State Park. Alex Morelan and Chad text and picture messages. As Alex observations before offset features were Trexler used a new photogrammetric destroyed by repair crews, and before and Chad collected slip observations, technique, known as Structure-from- much post-earthquake fault creep had I compiled a map in Google Earth and Motion, to build 3-D point clouds accrued. The results of this effort were directed them to unexplored sites along of offset features from overlapping digital photos.
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