M 3.6 - 4.5 mi N of town of Big Bear Lake, CA
Sunday, January 11, 2009 at 01:05:59 UTCLocation: 34.3°N 116.9°W Depth: 6km
Alert version 4
Summary
Estimated Population Exposed to Earthquake Shaking
Est. Modified Mercalli Intensity | Est. Population Exposure (k = x1000) | Perceived Shaking | Potential Structure Damage | |
---|---|---|---|---|
Resistant | Vulnerable | |||
X | 0 | Extreme | V. Heavy | V. Heavy |
IX | 0 | Violent | Heavy | V. Heavy |
VIII | 0 | Severe | Moderate/Heavy | Heavy |
VII | 0 | Very Strong | Moderate | Moderate/Heavy |
VI | 0 | Strong | Light | Moderate |
V | 0 | Moderate | V. Light | Light |
IV | 0 | Light | None | None |
II-III | 331k | Weak | None | None |
I | 9,192k* | Not Felt | None | None |
MMI | City | Population |
---|---|---|
III | Big Bear Lake | 6k |
III | Big Bear City | 6k |
II | Running Springs | 5k |
II | Victorville | 83k |
II | Mentone | 9k |
II | Yucaipa | 50k |
II | Redlands | 70k |
I | San Bernardino | 202k |
I | Riverside | 297k |
I | Anaheim | 328k |
I | Santa Ana | 343k |
Population exposure estimates are NOT a direct estimate of earthquake damage; comparable shaking will result in significantly lower losses in regions with well built structures than in regions with vulnerable structures. Overall, the population in this region resides in structures that are resistant to earthquake shaking, though some vulnerable structures exist.
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 an 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 exposure estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.
Maps
Map of MMI contours plotted over population per ˜1 square km (see gray scale bar on top of map). The regions of integer MMI values are separated by the thick contour lines and labeled with Roman numerals. The total population exposure to a given MMI value is obtained by summing the population between the thick contour lines. This total is shown in population exposure table.
Map of shaking intensity. This map shows the estimated MMI as a continuous color scale. The ground shaking estimates can be obtained from http://earthquake.usgs.gov/shakemap/ci/shake/10370561.
Exposure
Est. Modified Mercalli Intensity | Est. Population Exposure (k = x1000) | Perceived Shaking | Potential Structure Damage | |
---|---|---|---|---|
Resistant | Vulnerable | |||
X | 0 | Extreme | V. Heavy | V. Heavy |
IX | 0 | Violent | Heavy | V. Heavy |
VIII | 0 | Severe | Moderate/Heavy | Heavy |
VII | 0 | Very Strong | Moderate | Moderate/Heavy |
VI | 0 | Strong | Light | Moderate |
V | 0 | Moderate | V. Light | Light |
IV | 0 | Light | None | None |
II-III | 331k | Weak | None | None |
I | 9,192k* | Not Felt | None | None |
Table showing population exposed to different estimated Modified Mercalli Intensity (MMI) levels and the possible damage at different intensity levels for resistant and vulnerable structures. MMI describes the severity of an earthquake in terms of its effect on humans and structures and is a rough measure of the amount of shaking at a given location. Unlike earthquake magnitude, intensity varies with distance from the fault, and is influenced by the depth of the earthquake and the types of soils in the shaken region. Population outside the map bounds are not included in the totals.
Cities
MMI | City | Population |
---|---|---|
III | Big Bear Lake | 6k |
III | Big Bear City | 6k |
II | Running Springs | 5k |
II | Victorville | 83k |
II | Mentone | 9k |
II | Yucaipa | 50k |
II | Redlands | 70k |
II | Lake Arrowhead | 10k |
II | Mountain View Acres | 2k |
II | Highland | 51k |
I | Loma Linda | 20k |
I | Apple Valley | 64k |
I | Adelanto | 18k |
I | San Bernardino | 202k |
I | Grand Terrace | 12k |
I | Highgrove | 3k |
I | Calimesa | 7k |
I | Colton | 52k |
I | Hesperia | 73k |
I | Crestline | 11k |
I | Moreno Valley | 168k |
I | Banning | 30k |
I | Cabazon | 2k |
I | Muscoy | 9k |
I | Cherry Valley | 5k |
I | Riverside | 297k |
I | Bloomington | 22k |
I | Rubidoux | 32k |
I | Lake Los Angeles | 13k |
I | Avocado Heights | 15k |
I | Hawaiian Gardens | 15k |
I | Vincent | 15k |
I | San Marino | 13k |
I | La Palma | 16k |
I | Foothill Ranch | 11k |
I | Los Alamitos | 11k |
I | Citrus | 11k |
I | Pedley | 12k |
I | Commerce | 13k |
I | Canyon Lake | 11k |
I | Valle Vista | 11k |
I | East Hemet | 13k |
I | Rosamond | 18k |
I | South San Jose Hills | 21k |
I | Barstow | 21k |
I | Laguna Woods | 19k |
I | Sun City | 19k |
I | South El Monte | 22k |
I | Duarte | 22k |
I | West Puente Valley | 24k |
I | Valinda | 23k |
I | Twentynine Palms | 22k |
I | Yucca Valley | 19k |
I | Desert Hot Springs | 18k |
I | Rancho Mirage | 16k |
I | Wildomar | 16k |
I | Santa Fe Springs | 16k |
I | Artesia | 16k |
I | Beaumont | 18k |
I | Sierra Madre | 11k |
I | Mira Loma | 18k |
I | Coto De Caza | 18k |
I | Glen Avon | 16k |
I | Bermuda Dunes | 7k |
I | San Antonio Heights | 3k |
I | San Joaquin Hills | 3k |
I | Sedco Hills | 3k |
I | Romoland | 3k |
I | Lenwood | 3k |
I | Murrieta Hot Springs | 3k |
I | Homeland | 3k |
I | North El Monte | 3k |
I | Indian Wells | 3k |
I | Trabuco Canyon | 3k |
I | Desert View Highlands | 2k |
I | Irwindale | 1k |
I | Littlerock | 1k |
I | North Edwards | 1k |
I | Bradbury | 1k |
I | Quail Valley | 1k |
I | Lakeview | 1k |
I | Winchester | 2k |
I | Morongo Valley | 2k |
I | Boron | 2k |
I | Wrightwood | 4k |
I | Joshua Tree | 4k |
I | California City | 8k |
I | South San Gabriel | 7k |
I | Mecca | 7k |
I | Seal Beach | 24k |
I | Woodcrest | 8k |
I | Portola Hills | 9k |
I | Home Gardens | 10k |
I | East La Mirada | 9k |
I | Charter Oak | 9k |
I | Los Serranos | 7k |
I | East Pasadena | 6k |
I | Mayflower Village | 5k |
I | Nuevo | 4k |
I | Sunnyslope | 4k |
I | El Cerrito | 4k |
I | Las Flores | 5k |
I | Thousand Palms | 5k |
I | La Habra Heights | 6k |
I | Villa Park | 6k |
I | Lakeland Village | 5k |
I | Rossmoor | 10k |
I | La Verne | 33k |
I | Buena Park | 79k |
I | Newport Beach | 78k |
I | Lake Forest | 76k |
I | Bellflower | 75k |
I | Baldwin Park | 80k |
I | Lakewood | 82k |
I | Murrieta | 88k |
I | Alhambra | 88k |
I | Whittier | 85k |
I | Temecula | 85k |
I | Chino | 75k |
I | Upland | 74k |
I | Indio | 65k |
I | Yorba Linda | 64k |
I | Montebello | 64k |
I | Monterey Park | 63k |
I | Laguna Niguel | 66k |
I | Pico Rivera | 66k |
I | Hemet | 69k |
I | Tustin | 68k |
I | Chino Hills | 66k |
I | Westminster | 89k |
I | Mission Viejo | 96k |
I | Fontana | 169k |
I | Rancho Cucamonga | 168k |
I | Garden Grove | 167k |
I | Pomona | 156k |
I | Ontario | 172k |
I | Irvine | 189k |
I | Santa Ana | 343k |
I | Anaheim | 328k |
I | Huntington Beach | 195k |
I | Corona | 152k |
I | Pasadena | 144k |
I | Downey | 111k |
I | West Covina | 109k |
I | Norwalk | 109k |
I | Costa Mesa | 108k |
I | El Monte | 125k |
I | Orange | 128k |
I | Fullerton | 135k |
I | Palmdale | 135k |
I | Lancaster | 129k |
I | Laguna Beach | 24k |
I | La Habra | 59k |
I | Temple City | 37k |
I | Stanton | 37k |
I | La Quinta | 37k |
I | San Dimas | 36k |
I | Monrovia | 38k |
I | Brea | 39k |
I | San Gabriel | 41k |
I | Aliso Viejo | 41k |
I | Lake Elsinore | 40k |
I | Montclair | 35k |
I | Claremont | 35k |
I | Norco | 27k |
I | South Pasadena | 24k |
I | North Tustin | 24k |
I | Barstow Heights | 24k |
I | San Jacinto | 29k |
I | Coachella | 30k |
I | San Juan Capistrano | 35k |
I | Walnut | 31k |
I | Laguna Hills | 30k |
I | La Puente | 42k |
I | Palm Springs | 42k |
I | Hacienda Heights | 54k |
I | Cerritos | 53k |
I | Cathedral City | 52k |
I | Rowland Heights | 52k |
I | Rosemead | 56k |
I | Fountain Valley | 56k |
I | Diamond Bar | 58k |
I | Paramount | 57k |
I | Arcadia | 56k |
I | Glendora | 51k |
I | Rancho Santa Margarita | 51k |
I | Cypress | 47k |
I | Perris | 46k |
I | Bell Gardens | 46k |
I | Altadena | 43k |
I | South Whittier | 58k |
I | Azusa | 48k |
I | Placentia | 49k |
I | Palm Desert | 48k |
I | Covina | 48k |
I | La Mirada | 49k |
I | Rialto | 101k |
Table of MMI estimates and populations for settlements falling within the map boundaries. The settlement name, location, and population are obtained from the freely-available GeoNames geographical database.