Welcome and Thanks Goals: 1)Solicit new information 2) Tell you what we are up to 3)Get feedback on things you like or dislike To get right to it: Segmentation.

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Presentation transcript:

Welcome and Thanks Goals: 1)Solicit new information 2) Tell you what we are up to 3)Get feedback on things you like or dislike To get right to it: Segmentation vs the “inversion” Geodetic slip rates and block models Fault zones to link small faults and assign rates

modern 1500 A.D B.C B.C. Young Section Old Section BSSA: Biasi, 2002; Fumal, 2002; Scharer, 2007 Middle Section 12 meters 44 clastic layers 15 earthquakes 4 meters 44 clastic layers 14 earthquakes Composite Stratigraphic Column

Dated Interpolated Calendar Year (A.D.) Cumulative Thickness (cm) Cumulative Frequency Sedimentation Event Return Interval Clastic Accumulation Rate (cm/yr) 37 yr 0.6 cm/yr Young Section Earthquakes 2 cm/yr 12 yr 236 yr 0.4 cm/yr

Age of debris flow layer is age of underlying peat. avg Age Range # eqs# DF layersDF thicknessDF RI W Starting w/ W13

Pallett Creek

With a sedimentation rate of ~1 m/100 yrs, and individual clastic units representing on average 5-10 years, we can distinguish events that are likely separated by decades. Here are two earthquakes separated by just cms, and thus likely years (as the C-14 shows).

Interseismic deformation due to plate convergence Updip Deformation Sources Trench Central OR Coast