Portland, Oregon: The Oregon Department of Geology and Mineral Industries
(DOGAMI) has reissued tsunami inundation maps (TIMs) for northern Tillamook
County and the Coos Bay area that incorporate corrected estimated tsunami wave
height graphs.
TIM-Till-02, Tsunami Inundation Maps for Manzanita - Nehalem, 2012, scale
1:10,000.
TIM-Till-03, Tsunami Inundation Maps for Nehalem East, 2012, scale
1:10,000.
TIM-Till-04, Tsunami Inundation Maps for Rockaway Beach, 2012, scale
1:10,000.
TIM-Till-05, Tsunami Inundation Maps for Garibaldi - Bay City, 2012, scale
1:10,000.
TIM-Till-06, Tsunami Inundation Maps for Tillamook North, 2012, scale
1:12,000.
TIM-Till-07, Tsunami Inundation Maps for Tillamook South, 2012, scale
1:12,000.
TIM-Till-08, Tsunami Inundation Maps for Cape Meares, 2012, scale 1:10,000.
TIM-Till-09, Tsunami Inundation Maps for Netarts - Oceanside, 2012, scale
1:10,000.
TIM-Coos-05, Tsunami Inundation Maps for Coos Bay - North Bend, scale
1:12,000.
Example tsunami wave height graphs:
Graphs for the Manzanita-Nehalem area showing projected tsunami wave
heights over time for [left] local source (Cascadia Subduction Zone) and [right]
distant source (Alaska) modeled tsunami scenarios. Note that Cascadia Subduction
Zone tsunami waves can arrive within 15 minutes and last more than 8 hours.
Distant source tsunami waves will take much longer to arrive but can still be
very large and dangerous.
Each TIM publication contains two plates showing a wealth of information
including inundation extents, projected tsunami wave height time series charts,
and a measurement of the exposure each community has to various tsunami
scenarios.
Portions of DOGAMI TIM-Till-02 maps, showing inundation of
Manzanita-Nehalem-Wheeler area.
Plate 1 displays five scenarios, labeled as "T-shirt sizes" (S, M, L, XL,
and XXL), of the impact of Cascadia Subduction Zone tsunamis that reflect the
full range of what was experienced in the past and will be encountered in the
future. The geologic record shows that the amount of time that has passed since
the last great Cascadia earthquake (312 years since January 26, 1700) is not a
reliable indicator of the size of the next one, so the size ranges are intended
to fully bracket what might happen next.
Plate 2 shows tsunami inundation scenarios for two distant-source tsunamis
that were modeled and originate in Alaska. These distant tsunamis are not nearly
as dangerous as the local ones, as Oregonians will have several hours instead of
only minutes to evacuate and the tsunamis themselves are much smaller. For these
reasons DOGAMI's focus is on the big Cascadia events. If the ground shakes for
an extended period of time, don't wait for more warning, evacuate to high ground
as fast as possible.
To learn more about these publications, visit:
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