It was a busy summer for me and my students. Lots of fieldwork, including some really interesting trenching on the Sadie Creek fault in the northern Olympic Peninsula.
New papers from my lab group include Gunnar Speth’s recent publication in GSA Bulletin (congrats Gunnar!), as well as the trenching results and implication for paleoearthquake timing on the Leech River fault.
Speth, G., C. Amos, W. Amidon, G. Balco, A. Meigs, S. Graf (2018) Glacial chronology and slip rate on the west Klamath Lake fault zone, Oregon, Geological Society of America Bulletin, https://doi.org/10.1130/B31961.1.
Morell, K.D., C. Regalla, C. Amos, S. Bennett, L. Leonard, A. Graham, T. Reedy, V. Levson, A. Telka, (2018) Holocene surface rupture history of an active forearc fault redefines seismic hazard in southwestern British Columbia, Canada, Geophysical Research Letters, https://doi.org/10.1029/2018GL078711.
Congratulations to Ben Carlson, recent MS graduate co-advised with Liz Schermer, for publishing his thesis results in the Bulletin of the Seismological Society of America. Ben hand-excavated trenches across the Entiat fault in the eastern Cascades of WA to investigate Quaternary reactivation of this structure. Ben is now a geologist working for Shannon & Wilson, Inc. in Seattle.
Carlson, B.M., E.R. Schermer, C.B. Amos, B.L. Sherrod, W.J. Stephenson, S.A. Mahan (2018) Holocene fault reactivation in the eastern Cascades, WA, Bulletin of the Seismological Society of America, https://doi.org/10.1785/0120170228
Congrats to Jaime Delano on the publication of her thesis results in Geology! This paper focuses on how deformation associated with the Cascadia megathrust might drive upper-plate faulting and incision in forearc rivers.
Delano, J.E., C.B. Amos, J.P. Loveless, T. Rittenour, B. Sherrod, E. Lynch (2017) Influence of the megathrust earthquake cycle on active upper plate deformation in the Cascadia forearc of Washington State, Geology, doi: 10.1130/G39070.1.
Morell, K. D., C. Regalla, L. Leonard, C.B. Amos, and V. Levson, (2017) Late Quaternary rupture of a crustal fault system beneath Victoria, British Columbia, GSA Today, v. 27, doi: 10.1130/GSATG291A.1.
Although I am unable to attend the AGU fall meeting, several of my students and collaborators are presenting work at the meeting. Here’s the rundown:
First up is a session I put together with Alison Duvall and Jeni McDermott. Posters are Monday AM with talks in the afternoon. Looks like a great lineup:
EP11B Recent Advances in Tectonic Geomorphology: Dates, Rates, Models, and Beyond II Posters
Second is a talk Wednesday afternoon by Kristin Morell on our trenching work on the Leech River Fault:
T33D-02 Lidar and paleoseismic trenching reveal first documentation of late Quaternary onshore faulting in the forearc of southwestern British Columbia
And finally, MS student Gunnar Speth will be presenting his findings on active faulting in Central Oregon:
T41B-2921 Testing the time dependence of slip on the West Klamath Lake fault zone
I especially encourage prospective MS students attending the meeting to head over to Gunnar’s poster and grill him!
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., 17, 2239–2269, 10.1002/2015GC006033.
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)