T19 ~10,200 BP Cascadia: The Movie This sequence will start automatically and shows the Cascadia Holocene earthquake sequence, starting 10,000 years ago.

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Presentation transcript:

T19 ~10,200 BP Cascadia: The Movie This sequence will start automatically and shows the Cascadia Holocene earthquake sequence, starting 10,000 years ago as modeled from paleoseismic data. The slides are timed at 1 sec = ~65 years. Your computer may play them faster or slower. Approximate event ages are in years before present (BP). Event “size” is estimated from consistent turbidite thickness among core sites, and is shown by width and intensity of red shading Updip and downdip limits to slip are not constrained by our data, and are generalized from other studies referenced on the last slide. ?

T18 ~ 9800 BP ?

T17a ~9200 BP ?

T17 ~9100 BP ?

T16a ~9070 BP ?

T16 ~8900 BP Possibly the second largest Cascadia earthquake ?

T15a ~8459 BP ?

T15 ~8160 BP ?

T14a ~7940 BP ?

T14 Crater Lake (Mt. Mazama) erupts ~7630 BP ?

T13 ~7180 BP ?

T12a ~6900 BP

T12 ~ 6470 BP

T11 ~ 5960 BP Largest Turbidite. Largest Cascadia Earthquake? ?

T10f ~5770 BP ?

T10e ~ 5700 BP ?

T10d ~5700 BP ?

T10c ~5390 BP ?

T10b ~5260 BP ?

T10a ~5060 BP ?

T10 ~ 4770 BP End of a 1200 year gap on the northern margin ?

T9b ~4540 BP ?

T9a ~4440 ?

T9 ~4100 ?

T8b ~3890 BP ?

T8a ~3600 BP ?

T8 ~ 3440 BP

T7a ~3160 BP ?

T7 ~3030 BP ?

T6b ~2820 BP Northern San Andreas Fault ?

T6a ~2730 BP Northern San Andreas Fault

T6 ~2540 BP ?

T5c ~2320 BP ?

T5b ~2040 BP ?

T5a ~1820 BP ?

T5 ~ 1550 BP Another ~ 1000 year Gap (north only) Ends

T4a ~1420 BP ?

T4 ~1240 BP ?

T3a ~1070 BP ?

T3 ~ 800 BP

T2a ~550 BP ?

T2 ~ 480 BP The penultimate earthquake

T1 (AD1700) This event was recorded as a tsunami in Japan, and by First Nations legends

The Cascadia earthquake sequence was created by the Active Tectonics and Seafloor Mapping Laboratory, College of Earth, Ocean and Atmospheric Sciences, Oregon State University. It is a realization of compiled paleoseismic data from offshore and onshore studies compiled and analyzed in the following publications and references therein, and represent the preferred model from that publication. Other models are possible. Publications and data relating to this work may be found at: Cascadia paleoseismic data compiled in: Goldfinger, C., Nelson, C.H., Morey, A., Johnson, J.E., Gutierrez-Pastor, J., Eriksson, A.T., Karabanov, E., Patton, J., Gracia, E., Enkin, R., Dallimore, A., Dunhill, G., and Vallier, T., 2012, Turbidite Event History: Methods and Implications for Holocene Paleoseismicity of the Cascadia Subduction Zone, USGS Professional Paper 1661-F, Reston, VA, U.S. Geological Survey, p. 184 p, 64 Figures. Cascadia updip and downdip limits: Burgette, R.J., Weldon, R.J., II, and Schmidt, D.A., 2009, Interseismic uplift rates for western Oregon and along-strike variation in locking on the Cascadia subduction zone: J. Geophys. Res., v McCaffrey, R., Qamar, A., King, R.W., Wells, R.W., Khazaradze, G., Williams, C., Stevens, C., Vollick, J.J., and Zwick, P.C., 2007, Fault locking, block rotation and crustal deformation in the Pacific Northwest: Geophysical Journal International. Priest, G.R., Wang, K., Goldfinger, C., Zhang, Y., Witter, R.C., and Baptista, A.M., 2009, Fault Deformation Models for Generation Of Tsunamis From the Cascadia Subduction Zone: Implications for Seismic and Tsunami Hazards on The Washington and Northern Oregon Coast: Geological Society of America Abstracts with Programs, v. 41, p Northern San Andreas Fault paleoseismic data compiled in: Goldfinger, C., Grijalva, K., Burgmann, R., Morey, A.E., Johnson, J.E., Nelson, C.H., Gutierrez-Pastor, J., Karabanov, E., Chaytor, J.D., Patton, J., and Gracia, E., 2008, Late Holocene Rupture of the Northern San Andreas Fault and Possible Stress Linkage to the Cascadia Subduction Zone, Bulletin of the Seismological Society of America, v. 98, p et al.,2008.pdf Research supported by the National Science Foundation Divisions of Earth Sciences and Ocean Sciences, and the U.S. Geological Survey National Earthquake Hazard Reduction Program.