John D. Beaulieu and Dennis L. OlmsteadOregon Department of Geology and Mineral Industries1999Special Paper 31Mitigating Geologic Hazards in Oregon:A Technical Reference ManualOregon Department of Geology and Mineral Industries Special Papers ISSN 0278–3703Published in conformance with ORS 516.030This publication has been summarized in the Oregon Department of Geology andMineral Industries’ Special Paper 32: Geologic Hazards: Reducing Oregon’s Losses.For copies of publications, maps, or other information about Oregon’s geology andnatural resources, contact:Nature of the Northwest Information Center800 NE Oregon Street #5Portland, Oregon 97232(503) 872-2750http://www.naturenw.orgiiSPECIAL PAPER 31Mitigating Geologic Hazards in Oregon:A Technical Reference ManualbyJohn D. Beaulieu, Oregon State Geologist and Dennis L. Olmstead, Oregon Deputy State Geologist Oregon Department of Geology and Mineral IndustriesIn cooperation with:City of SalemMarion CountyPolk CountyOregon Emergency ManagementFederal Emergency Management Agency1999STATE OF OREGONDEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIESJohn D. Beaulieu, State GeologistivTable of contentsExecutive summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Why a technical reference manual? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1How to use this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Recognize that geologic hazards are a growing problem . . . . . . . . . . . . . . . . . . . . . .3Properly characterize the geologic hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Create an equitable team of stakeholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Know the specific reason for the strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Strategies are community specific . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Select from a range of strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Make the strategy permanent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Proceed with perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Appendix 1: The diversity of geologic hazards in Oregon . . . . . . . . . . . . . . . . . . . . . .8Appendix 2: Selected geologic disaster events in Oregon . . . . . . . . . . . . . . . . . . . . . .9Appendix 3: Damage from geologic hazards in Oregon . . . . . . . . . . . . . . . . . . . . . . .10Appendix 4: The total magnitude of geologic hazard risks in Oregon . . . . . . . . . . .12Appendix 5: Specific hazard characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Appendix 6: Multi-hazard considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Appendix 7: Appropriate level of effort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Appendix 8: Team membership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22Appendix 9: Roles of the strategy selection team . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Appendix 10: The role of state and federal agencies . . . . . . . . . . . . . . . . . . . . . . . . .24Appendix 11: Geologic hazard risk reduction by state and local agencies . . . . . . .26Appendix 12: Coordination of DOGAMI with other state agencies . . . . . . . . . . . . . .27Appendix 13: Selected statutes of DOGAMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Appendix 14: Selected statutes of Oregon Emergency Management . . . . . . . . . . . .29Appendix 15: DLCD Goal 7 regarding areas subject to natural hazards . . . . . . . . .31Appendix 16: Selected statutes of the Building Codes Division . . . . . . . . . . . . . . . .32Appendix 17: Range of strategies to reduce risk . . . . . . . . . . . . . . . . . . . . . . . . . . . .36Appendix 18: General patterns of geologic hazard risk reduction in Oregon . . . . .48Appendix 19: Risk reduction and the role of agencies . . . . . . . . . . . . . . . . . . . . . . . .49Appendix 20: Legal considerations . . . . . . . . . …
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