Map of Earthquake and Tsunami Damage Potential ... - Oregon

[Pages:1]STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES

W. Lawrence Givens, Governing Board Chair Vicki S. McConnell, Director and State Geologist Andree V. Pollock, Assistant Director, Geologic Survey and Services Rachel L. Smith, Project Operations Manager Ian P. Madin, Chief Scientist

Map of Earthquake and Tsunami Damage Potential for a Simulated Magnitude 9 Cascadia Earthquake

2013

OPEN-FILE REPORT O-13-06

Ground Motion and Ground Deformation Data and Maps for the 2012 Oregon Resilience Plan for Cascadia Subduction Zone Earthquakes

by Ian P. Madin and William J. Burns

PLATE 7

125?W 46?N 45?N 44?N

124?W

123?W

122?W

121?W

BACKGROUND

This map was prepared by The Oregon Department of Geology and Mineral Industries (DOGAMI) for the use of the Oregon Seismic Safety Policy Advisory Commission in completing the Oregon Resilience Plan for Cascadia Subduction Zone earthquakes. The map displays an estimate of the total potential damage due to ground shaking, ground failure (liquefaction and landslide), and tsunami inundation from a magnitude 9.0 Cascadia earthquake. This map is intended to provide nontechnical users with an estimate of the geographic distribution of damage. The damage categories are taken from the Modified Mercalli Intensity scale, which is based on observed effects on people, objects, and buildings. The damage potential categories are derived from the peak ground velocity map and tsunami inundation maps developed by DOGAMI for the Oregon Resilience Plan. Damage potential categories were assigned following the model of the U.S. Geological Survey ShakeMap program, and the tsunami inundation zone was assigned to the Very Heavy damage category, consistent with observations from recent great subduction earthquake tsunamis. See accompanying pamphlet for details.

LEGEND

Cities

Simulated Magnitude 9 Cascadia Earthquake Modified Mercalli Intensity Scale / Damage Potential

IV None: Felt indoors by many, outdoors by few, some awakened at night, Dishes, windows, doors, rattle and move, stationary cars rock.

V

Very Light: felt outdoors, sleepers wakened; liquids disturbed or spilled; small unstable objects upset; doors swing, pictures move.

VI

Light: felt by all; windows crack; dishes, glassware, books fall off shelves; pictures fall off walls; furniture moved; weak plaster, adobe buildings and poorly built masonry cracked.

Warrenton Astoria

Gearhart Seaside

26

Cannon Beach

26

Clatskanie

Rainier

202 47

Vernonia St. Helens/Columbia City

VII

Moderate: difficult to stand or walk; furniture broken; damage to poorly built masonry buildings; weak chimneys break; plaster, loose bricks, cornices, unbraced parapets and porches fall; some cracks in better masonry buildings.

VIII Moderate/Heavy: steering of cars affected; extensive damage to unreinforced masonry buildings, including partial collapse; fall of some masonry walls; twisting and falling of

IX Heavy: general panic; serious damage to collapse in old masonry buildings; wood frame structures rack and shift off foundations if unsecured; underground pipes broken.

X

Very Heavy (Includes Tsunami Inundation Zone): poorly built structures deXstroyed with their foundations; bridges and well-built wooden structures heavily

46?N

damaged and in need of replacement.

53

Rockaway Beach Tillamook

Scappoose

47

WASHINGTON

Hood River

Cascade Locks

30

84

6

6

120

Forest Grove/Cornelius

405

205

Portland/Metro

217

26

30

282

30

206

The Dalles

281

43

219

141

212

224

Sandy

205

240

Newberg Wilsonville

Estacada

35 173

219

5 Canby

216

McMinnville 221

211

233

130

18

Woodburn

Molalla

224

22

Sheridan

221

213

18B 18

Maupin

26

197

Lincoln City

22

Silverton

99EB

Dallas 22 Salem/Keizer

101

229

Depoe Bay

Monmouth

22

214

182

229

223

164

Stayton 22

164

20

226

22

Newport

180

Millersburg

Toledo

99W

Newport

Albany

Corvallis

Philomath

Tangent

Lebanon

45?N

97 218

293

Madras

361

Waldport 34

126

Florence Dunes City

501 36 126

99E 99W

20

Sweet Home

228

200 Harrisburg Junction City

126 69

Veneta Eugene/Springfield

225

222

200

Creswell

126 242

370

242

Prineville

Redmond

380

20

Bend

97

44?N

27

Reedsport

38 101

Lakeside

Cottage Grove

99

99

Oakridge

58

138

99

North Bend Coos Bay 241

101 540

42

Sutherlin

138

Bandon

Coquille

42S

Roseburg

42

Winston

Myrtle Point

43?N

99

42

Myrtle Creek

542

99

250

Port Orford

99

227

429

138 230 62

97 97

31

43?N

99

Shady Cove

422

Gold Beach

260

62

199

Grants Pass Rogue River

234

Eagle Point

99

199

Central Point

140

140

Medford

Phoenix

255

238

Talent

Cave Junction 46

Ashland

99

140 97

Klamath Falls

70

140

Brookings

42?N

66 273

39

42?N

CALIFORNIA

124?W

123?W

122?W

121?W

Coordinate System: NAD 1983 CORS96 Oregon Statewide Lambert Ft Intl Projection: Lambert Conformal Conic

Data layers: Earthquake and tsunami damage: DOGAMI; see Background text on this plate and accompanying pamphlet for details. Roads: Oregon Department of

0

Geographic Coordinate System: NAD 1983 CORS96

Transportation, 2008. Urban growth boundaries: Oregon Department of Land

Datum: NAD 1983 CORS96

Conservation and Development (DLCD) (2011).

0

Cartography by Ian P. Madin.

10

20

25

30

40

50 Kilometers

50 Miles

TRUE NORTH

NOTICE This map cannot serve as a substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from those shown on the maps. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. government.

For copies of this publication contact: Nature of the Northwest Information Center

800 NE Oregon Street, #28, Ste. 965 Portland, Oregon 97232

telephone (971) 673-2331

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