Congrats to Beth Haddon and co. on the publication of her MS thesis in G-cubed! This paper presents new constraints on the distribution of slip during large earthquakes in Owens Valley (as well as on the late-Quaternary slip rate) based on airborne lidar and field observations. The paper also includes a new MATLAB-based tool written by Olaf Zielke (LaDiCaoz_v2) for analyzing lateral and vertical fault offsets.
Haddon, E.K., Amos, C.B., Zielke, O., Jayko, A.S. and Bürgmann, R. (2016), Surface Slip during Large Owens Valley Earthquakes. Geochem. Geophys. Geosyst.. Accepted Author Manuscript.
Both MS student Jaime Delano and I are presenting research this year at the annual AGU meeting in San Francisco.
Jaime is first up, with a poster on Wednesday afternoon on comparing long-term records of incision and fault slip to short-term interseismic deformation in the southern Olympic Mountains of WA.
T33C-2944: Fluvial Record of Active Deformation Along the Canyon River Fault in the Wynoochee River Valley, WA.
On Thursday afternoon, I am giving a talk on active faults in the southern Walker Lane Belt, generally on discrepancies between slip rates determined from geologic and geodetic records.
T43E-04: Steady, modest slip over multiple earthquake cycles on the Owens Valley and Little Lake fault zone.
Stop by either one (or both) and say hello!
Congrats to Adrian Bender and co. on the publication of his MS thesis in JGR – Solid Earth! This paper presents some of the first Late-Quaternary uplift/shortening rates for the Yakima folds based on the cosmogenic isochron technique. Bottom line: the folds (and likely the underlying faults) are active, and shortening is distributed among several active folds in the area.
Oops – it’s been about a year since I’ve updated the site. Never saw that coming. It’s been a busy year with new students, field projects, classes, even a trip to Taiwan!
First off, BIG congratulations to MS students Beth Haddon and Adrian Bender, as well as senior thesis student Tabor Reedy for graduating this spring / summer! Adrian is now working as a term geologist with the Alaska Science Center in Anchorage, and Beth is teaching as a lecturer at San Francisco State. Tabor has been lending his services to various field and trenching projects throughout the northwest while he applies to grad school for next year.
Both Beth and Adrian submitted papers on their thesis work
Haddon, E.K., C.B. Amos, O. Zielke, A.S. Jayko, and R. Bürgmann (in revision, 2015) Surface Slip during Large Owens Valley Earthquakes, G-Cubed.
Bender, A.M., C.B. Amos, D.H. Rood, L. Staisch, H. Kelsey, and B. Sherrod (in revision, 2015) Differential uplift and incision of the Yakima River terraces, JGR – Solid Earth.
Downloadable copies of their theses are available here:
The annual GSA meeting in Vancouver is coming up, and work from our group will be presented in two sessions:
First up, I will be giving a talk in session T38 (Geology of Earthquakes, Faults, and Fault Systems) on Tuesday, 10/21 at 2:00 PM:
Amos, C.B., P. Audet, W.C. Hammond, R. Bürgmann, I.A. Johanson, and G. Blewitt (2014) Uplift and seismicity driven by groundwater depletion in central California, Geological Society of America Annual Meeting Abstracts with Programs. Vol. 46, No. 6, p. 594. (Invited)
Our study on the effects of groundwater loss on uplift and seismicity has been featured in a variety of news sources, notably the LA Times, the Washington Post, BBC News, The Guardian, Christian Science Monitor, Earth Magazine, and several other outlets. Nature also recorded a podcast with me, which you can access here.
Paul Lundgren (JPL) also wrote a News and Views piece to accompany our paper that serves as a nice summary and perspective piece.
GPS station P311 in the eastern Sierra Nevada of California, administered by the EarthScope Plate Boundary Observatory. Modest, contemporary vertical uplift of this and other GPS stations in the Sierra Nevada and Coast Ranges across central California is attributed to human-caused groundwater depletion in the adjacent San Joaquin Valley. Image from UNAVCO.
Former senior thesis student Skyler Sorsby will be presenting a portion of his senior thesis research at the upcoming GSA Cordilleran meeting in Bozeman. Skyler’s talk will be Tuesday morning May 20th at 11:00 AM. He will cover mapping of the channel planform and terrace mapping from lidar data, as well as some preliminary results from cosmogenic isochron dating of terrace remnants.
The session, T17. Tectonic and Climatic Drivers in Geomorphology and Landscape Evolution, looks to be a good one!
UPLIFT AND INCISION OF THE YAKIMA RIVER CANYON FROM CHANNEL PLANFORM MAPPING AND COSMOGENIC 26AL/10BE ISOCHRON DATING
SORSBY, Skyler, AMOS, Colin, BIERMAN, Paul R., HANSON, Kathryn, ROOD, Dylan H., FISHER, G. Burch III, and KELSEY, Harvey M.