Transcript HAWAII KAI TSUNAMI HAZARD

TSUNAMI HAZARD TO
Hawaii from a M9+
Event similar to 2004
Indian Ocean Tsunami
SAWG
Hawaii Civil Defense
11/2007
Hambantota, Sri Lanka
Dr. Hermann Fritz surveyed after
December 26, 2004 Indian Ocean Tsunami
 Noted that it was similar to Hawaii Kai
with reef outside with a channel under a
road along the sea shore into a large
shallow lake.

HAMBANTOTA, SRI LANKA
December 26, 2004 Tsunami

DEATH ZONE WAS AREA BELOW 10 METERS and LESS
THAN 1 KILOMETER FROM SHORE.
Sri Lanka Multiple Tsunami Waves
Most witnesses described 3 main waves.
 The first knocked them off their feet, the
second picked them up and carried them,
often up to 50 km/hr, and the third bore
them up to 15 meters high or sucked
them under.

Fritz Indian Ocean Tsunami Survey
Conclusions
Evacuate all areas below 15 meters above
sea level and within 0.25 mile of shoreline
or along rivers.
 Evacuate all areas below 10 meters above
sea level and within 1.0 mile of shoreline
or along rivers.
 Evacuate all areas below 5 meters above
sea level and within 3 miles of shoreline.


The Fritz Indian Ocean Evacuation Criteria



Consider the 1946 historical observations as recorded in
United States Tsunamis - 1690-1988 (page 66)




Waipio Valley - 12 meter run-up amplitude
Swept 1 mile into valley, pulled away homes and people
and left only foundations



Waikolu Valley, Molokai - 16.4 meter run-up amplitude
Destroyed farms and buildings up entire valley.




Makapuu Point, Oahu - 11.1 meter run-up amplitude
Destroyed the nearby Ranch buildings with 3 waves (Helsley
from wave deposits) leaving only foundations.




Three wide valleys destroyed by the 1946 tsunami are
historical evidence that the Fritz Indian Ocean Criteria
is also appropriate for Hawaii .
M9+ Tonga Trench Tsunami
At Source Tsunami 25 m High, 200 km
wavelength, 15 minute period, 1100 km
long.
3.2 meter
High
Tsunami
off Oahu
in 4321 m
deep
Ocean
M9+ Marianas Trench Tsunami
10 meter
HIGH
Tsunami off
Oahu in
4321 m
deep Ocean
M9+ Japan
Trench
A 10 meter
high
Tsunami
moves down
Island chain
15 meter
High
Tsunami
South of
Honolulu in
641 m deep
Ocean
MOVIE AVAILABLE ON NMWW DVD