Introduction -- Seismology -- Recording stations -- Travel-time curve -- Main earthquake -- Epicenter and origin time -- Magnitude and intensity -- Depth of focus -- Source motion -- Aftershocks -- Geology -- Stratigraphy -- Gable Volcanics -- Oligocene marine sedimentary rocks -- Columbia River basalt -- Plio-Pleistocene rocks -- Recent alluvium -- Structure -- Recommendations -- Acknowledgements -- References