Page 10 - FY Annual Report 2017-18

Perceived shaking and damage potential Perceived shaking and damage potential

SIMULATED CASCADIA SUBDUCTION ZONE MAGNITUDE 9.0 SIMULATED PORTLAND HILLS FAULT ZONE MAGNITUDE 6.8

-123° Perceived Shaking and Damage Potential -123°
! Scappoose ! Scappoose
Simulated Cascadia Subduction Zone Magnitude 9.0 Earthquake
C O L U M B I A C O . C O L U M B I A C O .
! Timber !
Timber

! !
Cascade Cascade
Burlington Locks Locks
Glenwood ! ! Vancouver Glenwood ! ! Burlington
! ! Vancouver
! ! North
Banks Banks
T I L L A M OO K ! North Plains T u a l a t i n M o u n t a i n s C L A R K C O . S KA M A N I A C O . T I L L A M OO K Plains T u a l a t i n M o u n t a i n s C L A R K C O .
C O . Camas C O . ! Camas SKA M A N I A C O .
! !
Rockcreek Maywood Park Rockcreek
! Cedar ! ! !
Forest Mill ! Forest Cedar
Wood
Grove Cornelius Hillsboro Village ! Grove Cornelius Hillsboro Mill ! Wood !
W A S H I N G T O N C O . ! ! ! ! ! ! Village
Gresham 45.5° Gresham 45.5°
Aloha Raleigh ! Aloha Beaverton !
! ! Hills !
Beaverton ! !
M U L T N O M A H C O . M U LT N O M A H C O .
W AS H I N G T
Gaston ! Milwaukie ! Happy Valley C L A C K A M AS C O . O N C O . !Milwaukie ! Happy Valley C L A C K A M A S C O .
! Tigard ! Sunnyside Gaston ! Lake
! Lake Oak Grove ! Boring YA M H I LL C O . Tigard ! Oswego Oak Grove !Sunnyside Boring !
King City Oswego ! ! ! !
! ! Johnson City ! King City !
Sandy ! Brightwood
Modified Tualatin ! Gladstone ! Modified Brightwood ! Gladstone ! Sandy
Mercalli Mercalli ! Tualatin !
Intensity Perceived Damage ! Sherwood ! Intensity Perceived Damage Mount ! Damage Sherwood ! ! !
Modified mercalli
Perceived
Scale Shaking Potential Oregon Scale Shaking Potential Village Potential Oregon Mount Rhododendron
Hood
City
Hood
shaking
intensity scale
Rhododendron
City
Village
!
Camp
IV Light None IV IV Light None Light None Government ! Government
Camp
Wilsonville ! !
! ! Estacada Wilsonville !
Very
H OO D
V
Moderate
Moderate
light/essential structures have been
After those critical Canby V V Moderate Very Very light R I V E R ! Estacada H OO D
R I VE R
C O .
! light Canby C O .
!
assessed, building inspection staff will be deployed t M A R I O N Barlow OREGON W A S C O ! W AS C O
OREGONo
!
C O .
C O .
VI Strong Light C O . VI VI Strong Light Strong Light M A R I O N Barlow
C O .
do rapid assessments—10-minute evaluations of build-
ings throughout the County to identify which buildings VII Very Strong Moderate
Very
VII Moderate VII Very Moderate
Strong
are safe and, more importantly, which are not. Strong
Molalla ! VIII Severe Moderate/ Molalla !
Moderate/
Modified Mercalli
“Time is of the essence, particulary if aftershocks are VIII Severe Moderate/ Heavy
VIII
Severe
Heavy
Heavy
involved,” said Kofi Nelson-Owusu, Building Engineer. IX Violent Heavy Intensity Scale
Ripplebrook Intensity Ripplebrook
“Structures in areas affected by aftershocks are more ! !
IX Violent Heavy IX Violent Heavy
likely to be unsafe. They need to be identified as haz-
Scotts Mills ! Scotts Mills !
ardous so people understand the danger and stay out.” ¹ danger of collapse; yellow for limited occupancy, which
Building Services has 21 employees who are qualified to can mean portions can be occupied or that it’s safe to ¹
do rapid assessments. Two of the 21 obtained their cer- Miles 0 2.5 5 10 enter to retrieve belongings; and red for unsafe, do Miles 0 2.5 5 10
tifications in FY 2017–18. An additional 11 are expected Kilometers 0 4 8 16 not enter." Kilometers 0 4 8 16
to be certified in FY 2018–19.
Staff is gathering data to identify the areas likely to be
“Rapid assessment involves a very quick inspection hardest hit, said Gary Nielson, Building Engineer. In 80 81
to determine the likelihood of structural collapse,” Lin- addition to building construction and design, soil and
festy said. “After assessing a building, staff will leave Maps courtesy of Oregon Department weather conditions in certain areas can be heavy dam-
a color-coded note on it: Green for occupancy with no of Geology and Mineral Industries age predictors.
Continued on page 9
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