PAGER - M 5.7 - LIBERTADOR O'HIGGINS, CHILE

Alert Version: 1Friday, March 5th, 2010 at 03:34:32 UTCLocation: 34.4° S, 71.7° WDepth: 23kmEvent Id: US2010TLAFCreated: 22 minutes, 24 seconds after earthquake.

Overall, the population in this region resides in structures that are vulnerable to earthquake shaking, though some resistant structures exist. A magnitude 5.9 earthquake 91 km North of this one struck Chile on February 22, 1996 (UTC), with estimated population exposures of 114,000 at intensity VII and 205,000 at intensity VI, with no reported fatalities. On March 3, 1985 (UTC), a magnitude 7.9 earthquake 142 km Northwest of this one struck Valparaiso, Chile, with estimated population exposures of 5,449,000 at intensity VII and 2,647,000 at intensity VI, resulting in a reported 177 fatalities. Recent earthquakes in this area have caused landslides and liquefaction that may have contributed to losses.

Exposure Summary

Estimated Population Exposed to Earthquake Shaking

Est. Modified Mercalli Intensity	Est. Population Exposure	Perceived Shaking	Potential Structure Damage
Est. Modified Mercalli Intensity	Est. Population Exposure	Perceived Shaking	Resistant	Vulnerable
X	0	Extreme	V. Heavy	V. Heavy
IX	0	Violent	Heavy	V. Heavy
VIII	0	Severe	Moderate/Heavy	Heavy
VII	5k	Very Strong	Moderate	Moderate/Heavy
VI	93k	Strong	Light	Moderate
V	253k	Moderate	V. Light	Light
IV	1,999k	Light	none	none
II-III	7,045k*	Weak	none	none
I	--*	Not Felt	none	none

*Estimated exposure only includes population within calculated shake map area

Population Exposure
Population per ~1 sq. km. from LandScan

Selected Cities Exposed

MMI	City	Pop.
V	Santa Cruz	33k
IV	San Vicente	23k
IV	Teno	7k
IV	Chimbarongo	17k
IV	Curico	102k
IV	Rengo	38k
IV	Rancagua	213k
III	Talca	197k
III	vina causino	510k
III	Santiago	4,837k
III	Valparaiso	282k

Shaking Intensity

Full City Exposure List

MMI	City	Population
V	Santa Cruz	33k
IV	San Vicente	23k
IV	Teno	7k
IV	Chimbarongo	17k
IV	Curico	102k
IV	Rengo	38k
IV	Molina	29k
IV	Rancagua	213k
IV	Melipilla	63k
IV	San Antonio	86k
IV	Machali	28k
III	El Monte	23k
III	Graneros	23k
III	Talagante	52k
III	Paine	33k
III	Penaflor	66k
III	Talca	197k
III	Buin	55k
III	Constitucion	38k
III	San Clemente	14k
III	San Javier	22k
III	San Bernardo	250k
III	vina causino	510k
III	Santiago	4,837k
III	Quilpue	130k
III	Lampa	29k
III	Valparaiso	282k
III	Linares	70k
III	Vina del Mar	295k
III	Villa Alemana	97k
III	Limache	36k
II	Llaillay	17k
II	Quillota	68k
II	Los Andes	57k

Downloads

PAGER results are generally available on the Internet within 30 minutes of the earthquake’s occurrence. However, information on the extent of shaking will be uncertain in the minutes and hours following and earthquake and typically improves as additional sensor data and reported intensities are acquired and incorporated into models of the earthquake's source. Users of PAGER estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.