Geologic Framework of the Clarno Unit, John Day Fossil Beds National Monument, Central Oregon
OREGON GEOLOGY published by the Oregon Department of Geology and Mineral Industries VOLUME 61, NUMBER 1 JANUARY/ FEBRUARY 1999 IN THIS ISSUE: GEOLOGIC FRAMEWORK OF THE CLARNO UNIT, JOHN DAY FOSSIL BEDS NATIONAL MONUMENT, CENTRAL OREGON REPORTS ON EARTHQUAKE SWARM AT MOUNT HOOD AND EARTHQUAKE DAMAGE TO LIFELINES IN COLOMBIA OREGON GEOLOGY Mount Hood earthquake swarm of January 1999 VOLUME 61 , NUMBER 1 JAN./FEB. 1999 During the month of January, Mount Hood experi ,...,.".... """"""""" 1Muo'y. MMII. .....,.. W\<. ~. w __ by "" 0."", 00pWnenI oJ enced an earthquake swarm similar to past events. This Gtoqy ... _~~~,,,,,,,,,,CI __ ""'o.,,,,) swarm produced 81 recorded events, including 4 events COoverning Board between magnitude 3.0 and 3.2, Events were felt at Jacqueline G, Haggerty, Chair .. .. ..... ................. .......... " ........ Ent e rpri~ Timberline, Brightwood, Parkdale, and Mount Hood A~een N. Barnett .. ...... ...... " ..... ...... ...... ........... ............. ..... ", .. Portland Donald W. Christensen.. ____ . Depoe Bay Meadows. The majority of events (41) occurred on State Geologist .... ...... ...... " .... " .... " ..... ...... ..... " .... ,' .... , Donald A. Hull Monday, January 11, followed by 9 events on January Oeputy State Geologist .... ...... ...... " .... " ..... " .... .. .. " .. John D. Beaulieu 12, 1 event on January 13, 18 events on January 14, Editor .... " ...... ...... .................. " ..... ...... ....... ......... Klaus K,E. Neuendorf and 12 events on January 15. The earthquakes Production Assistants ..... " ..... ...... ...... ....... ...... " .... " .... ". Geneva Beck were Kate Halstead focused approximately 6 km to the south-southeast of Main OHic~; Su ite 965. 800 NE Oregon Street II ~8. Portland 97132. the summit of Mount Hood, with hypocenter depths phone (503) 731·4100, FAX (503) 731·4066. ranging from 1.1 to 9.4 km below the surface. In the Interne!; http:// sarvis.dogami, state ,0r.Us 8ak~r City Field OHic~; 1831 First Street.
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