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Vulnerability of Panay Island to Seismic Hazards

I. HISTORICAL EARTH!A"ES I# PA#A$ ISLA#%

• December 1621, magnitude 7.9, epicenter at Pandan Bay,

Antique

• May 13, 1787, magnitude 7.9, epicenter at Pandan Bay, Antique

• Juy 13, 1787, epicenter in !"i"

• #ebruary 2, 1887, magnitude 7.$, epicenter Antique and !"i"

• January 2%, 19$8 at 1&$6AM, magnitude 8.3, epicenter in

Antique

• June 19, 1961, magnitude %.7, epicenter in 'aba( !(and

• June 1$, 199) at 3&$)PM, magnitude 7.1, epicenter in Antique

'*e(e eart*qua+e( ere -et in "/a( 0ity ranging -r"m inten(ity t" !!!.

Aerage gap "- t*e(e rec"rded *i(t"rica eart*qua+e( (ince t*e pani(* era&

eery &' years

II. VOLCA#OES I# PA#A$ ISLA#%

'*ere i( n" actie "can" in t*e i(and. '*e t" "can"e( 4Pan de

Azucar5 offshore of Concepcion, Iloilo are c"n(idered inactied"rmant

 becau(e t*ey *ae n" rec"rd "- pa(t erupti"n(.

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 III. SEIS(IC HA)AR%

'*e !(and "- Panay *a( been pr"ne t" eart*qua+e(. !t *a( t*ree

eart*qua+e generat"r(&

1. t*e Tablas *ault . e/tend( -r"m 'aba( !(and t" B"racay and

t" t*e n"rt*e(tern tip "- Panay

2. t*e +est Panay *ault  an actie -aut t*at inter(ect( -r"m t*e

n"rt*e(tern t" ("ut*e(tern Panay. !t(

appr"/imate trace i( in t*e Municipaitie(

  "-

Tan,alan- (aato- (alinao-

(adala,, and Libacao in AA:;

/amindan and Ta0az in 0AP!<;

and -r"m Lambunao t" San /oa1uin in

!=!=.

3. t*e #e,ros Trenc2  a (ubducti"n >"ne "-- ("ut*ern Panay,?uimara(, and :egr"( !(and( cau(ed by t*e

  c"ntinu"u( (ubducti"n "- uu ea beneat*

  t*e t*ree i(and(.!t i( be*ind t*e -"rmati"n

and actiity "- ana"n "can".

P@!=0 i( currenty impementing it(

ne pr"ect caed ADC aim( t" e/acty

  "cate actie -aut( in t*e P*iippine(. '*e

e(t Panay #aut mig*t be mapped t" a

arger (cae in t*e year 2)1) (" t*at it can be integrated t" >"ning actiitie( "- "ca

g"ernment(.

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III3A. S!SCEPTI4ILIT$ TO TS!#A(I

A 53meter 2i,2 tsunami i be triggered in ca(e "- a ma,nitude 6.7 

eart*qua+e *"(e epicenter i( in t*e Panay ?u- "r uu ea. '*e c"a(ta

area( identi-ied t" be a--ected are t*e c"a(ta area( "- San /oa1uin- (ia,ao-

8uimbal- Ti,bauan- Oton, and Iloilo City.

III34. S!SCEPTI4ILIT$ TO LI!E*ACTIO#

'*e coastal areas of Iloilo City and m"(t in t*e eastern to9ns of

Iloilo are pr"ne t" ique-acti"n in ca(e "- a arge eart*qua+e in t*e i(and.

Li1uefaction i( a pr"ce(( t*at tran(-"rm( t*e be*ai"r "- c"*e(i"ne(( ("i

-r"m a ("id t" a iquid.

III3C. S!SCEPTI4ILIT$ TO EARTH!A"E3

I#%!CE% LA#%SLI%ES

"me p"rti"n( "- Panay i(and are pr"ne t" and(ide( in ca(e "- an

intensity VII t" intensity VIII eart*qua+e.