PAGER - M 3.1 - 3.5 km (2.2 mi) SE of Signal Hill, CA
Alert level does not include impacts from earthquake-related hazards such as tsunamis, landslides, fires or liquefaction.
Earthquake Shaking Alert Level: GREEN
Download Alert PDFWhat's this?Thursday, August 18th, 2011 at 21:43:49 UTC (14:43:49 local)Location: 33.8° N, 118.1° WDepth: 19kmEvent Id: CI10995205Alert Version: 5Created: 1 day, 0 hours after earthquake.
Alert Information
Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.
Estimated Fatalities
| ESTIMATED FATALITIES (LEVEL) | Probability (%) |
|---|---|
| 0 (GREEN) | 99 |
| 1 to 9 (YELLOW) | 1 |
| 10 to 99 (YELLOW) | 0 |
| 100 to 999 (ORANGE) | 0 |
| 1 to 10 thousand (RED) | 0 |
| 10 to 100 thousand (RED) | 0 |
| 100 thousand + (RED) | 0 |
Estimated Economic Losses
| ESTIMATED VALUE IN USD (LEVEL) | Probability (%) |
|---|---|
| 0 to 1 million (GREEN) | 99 |
| 1 to 10 million (YELLOW) | 1 |
| 10 to 100 million (YELLOW) | 0 |
| 100 million to 1 billion (ORANGE) | 0 |
| 1 to 10 billion (RED) | 0 |
| 10 to 100 billion (RED) | 0 |
| 100 billion + (RED) | 0 |
Detailed Information
| Estimated Modified Mercalli Intensity | I | II-III | IV | V | VI | VII | VIII | IX | X | |
|---|---|---|---|---|---|---|---|---|---|---|
| Est. Population Exposure | 15,709k | 2,787k | 178k | 0 | 0 | 0 | 0 | 0 | 0 | |
| Perceived Shaking | Not Felt | Weak | Light | Moderate | Strong | Very Strong | Severe | Violent | Extreme | |
| Potential Structure Damage | Resistant | none | none | none | V. Light | Light | Moderate | Moderate/Heavy | Heavy | V. Heavy |
| Vulnerable | none | none | none | Light | Moderate | Moderate/Heavy | Heavy | V. Heavy | V. Heavy | |
*Estimated exposure only includes population within calculated shake map area
Population Exposure
Population per ~1 sq. km. from LandScan
Population per ~1 sq. km. from LandScan
Structure Information Summary
Overall, the population in this region resides in structures that are highly resistant to earthquake shaking, though some vulnerable structures exist.
Historical Earthquakes (with MMI)
| Date (UTC) | Dist (km) | Mag | Max MMI (#) | Shaking Deaths |
|---|---|---|---|---|
| 1984-11-26 | 395 | 5.1 | V (17k) | 0 |
| 1994-01-17 | 58 | 6.7 | IX (181k) | 33 |
| 2003-12-22 | 337 | 6.6 | VII (213) | 2 |
Recent earthquakes in this area have caused secondary hazards such as landslides and liquefaction that might have contributed to losses.
Selected Cities Exposedfrom GeoNames Database of Cities with 1,000 or more residents.
| MMI | City | Population |
|---|---|---|
| IV | Signal Hill | 11k |
| III | Long Beach | 483k |
| III | Los Alamitos | 12k |
| III | Rossmoor | 11k |
| III | Lakewood | 82k |
| III | Seal Beach | 24k |
| I | Anaheim | 328k |
| I | Santa Ana | 343k |
| I | Los Angeles | 3,695k |
| I | Riverside | 298k |
| I | North Glendale | 203k |
(k = x1,000)
| # | Date/Time | Mag | Lat, Lon, Depth | Country | Max MMI (Exposed) | Deaths | Secondary Effects | |
|---|---|---|---|---|---|---|---|---|
| Shaking | Total | |||||||
| 1 | 1973-02-21 14:45 UTC | 5.9 | 34.06° N, 119.05° W 6km | US | VIII (4 k) | 0 | 0 | |
| 2 | 1978-05-05 21:03 UTC | 5.5 | 32.22° N, 115.32° W 5km | MX | VIII (97) | 0 | 0 | |
| 3 | 1978-08-13 22:54 UTC | 5.8 | 34.39° N, 119.64° W 8km | US | VIII (40 k) | 0 | 0 | |
| 4 | 1979-03-15 21:07 UTC | 5.5 | 34.2° N, 116.53° W 15km | US | VII (744) | 0 | 0 | |
| 5 | 1979-10-15 23:17 UTC | 6.5 | 32.82° N, 115.64° W 9km | US | IX (3 k) | 0 | 0 | |
| 6 | 1979-10-16 05:49 UTC | 5.6 | 33.02° N, 115.57° W 5km | US | VIII (611) | 0 | 0 | |
| 7 | 1979-10-16 06:19 UTC | 5.1 | 32.73° N, 115.76° W 10km | US | VII (77) | 0 | 0 | |
| 8 | 1979-10-16 06:58 UTC | 5.6 | 32.95° N, 115.62° W 10km | US | VIII (287) | 0 | 0 | |
| 9 | 1979-10-16 23:16 UTC | 5.5 | 32.92° N, 115.55° W 4km | US | VIII (40) | 0 | 0 | |
| 10 | 1980-02-25 10:47 UTC | 5.6 | 33.52° N, 116.55° W 6km | US | VII (847) | 0 | 0 | |
| 11 | 1980-06-09 03:28 UTC | 6.3 | 32.27° N, 114.91° W 5km | MX | IX (336) | 1 | 1 | |
| 12 | 1981-04-26 12:09 UTC | 5.9 | 33.12° N, 115.64° W 1km | US | VIII (11) | 0 | 0 | |
| 13 | 1981-09-04 15:50 UTC | 5.8 | 33.9° N, 119.03° W 15km | US | VI (13 k) | 0 | 0 | |
| 14 | 1983-05-02 23:42 UTC | 6.3 | 36.22° N, 120.3° W 10km | US | IX (29) | 0 | 0 | |
| 15 | 1983-05-02 23:46 UTC | 5.7 | 36.23° N, 120.29° W 8km | US | VIII (1 k) | 0 | 0 | |
| 16 | 1983-07-09 07:40 UTC | 5.1 | 36.17° N, 120.37° W 1km | US | VII (10 k) | 0 | 0 | |
| 17 | 1983-07-22 02:39 UTC | 5.7 | 36.2° N, 120.34° W 7km | US | VII (1 k) | 0 | 0 | |
| 18 | 1984-11-23 18:08 UTC | 5.8 | 37.34° N, 118.51° W 15km | US | VIII (8 k) | 0 | 0 | |
| 19 | 1984-11-26 16:21 UTC | 5.1 | 37.29° N, 118.76° W 10km | US | V (17 k) | 0 | 0 | landslide |
| 20 | 1985-08-04 12:01 UTC | 6.1 | 36.14° N, 120.11° W 15km | US | IX (713) | 0 | 0 | |
| 21 | 1986-07-08 09:20 UTC | 6 | 33.97° N, 116.78° W 12km | US | VIII (8 k) | 0 | 0 | landslide |
| 22 | 1986-07-13 13:47 UTC | 5.8 | 33.05° N, 117.85° W 2km | US | V (9,528 k) | 0 | 1 | landslide |
| 23 | 1987-10-01 14:42 UTC | 5.9 | 34.06° N, 118.13° W 14km | US | VIII (20 k) | 8 | 8 | |
| 24 | 1987-10-04 10:59 UTC | 5.2 | 34.02° N, 118.14° W 11km | US | VII (453 k) | 0 | 1 | |
| 25 | 1987-11-24 01:54 UTC | 6 | 33.22° N, 115.79° W 15km | US | VIII (250) | 0 | 2 | |
| 26 | 1987-11-24 13:15 UTC | 6.5 | 33.07° N, 115.95° W 2km | US | IX (599) | 0 | 0 | |
| 27 | 1988-02-11 15:25 UTC | 4.8 | 34.08° N, 118.05° W 12km | US | VII (11 k) | 0 | 1 | |
| 28 | 1988-12-03 11:38 UTC | 5 | 34.15° N, 118.13° W 13km | US | VI (1,090 k) | 0 | 0 | |
| 29 | 1989-01-19 06:53 UTC | 5.2 | 33.91° N, 118.7° W 9km | US | VI (14 k) | 0 | 0 | |
| 30 | 1990-02-28 23:43 UTC | 5.7 | 34.14° N, 117.75° W 3km | US | VIII (12 k) | 0 | 0 | |
| 31 | 1991-06-28 14:43 UTC | 5.6 | 34.24° N, 118.01° W 11km | US | VII (8 k) | 1 | 1 | |
| 32 | 1992-04-23 04:50 UTC | 6.2 | 33.87° N, 116.52° W 4km | US | VIII (16 k) | 0 | 0 | |
| 33 | 1992-06-28 11:57 UTC | 7.3 | 34.18° N, 116.53° W 11km | US | IX (2 k) | 1 | 1 | |
| 34 | 1992-06-28 15:05 UTC | 6.5 | 34.29° N, 116.82° W 12km | US | IX (2 k) | 0 | 0 | landslide |
| 35 | 1992-06-29 10:14 UTC | 5.7 | 36.77° N, 116.32° W 11km | US | VIII (127) | 0 | 0 | |
| 36 | 1992-06-29 16:01 UTC | 5.5 | 33.82° N, 116.44° W 15km | US | VIII (8 k) | 0 | 0 | |
| 37 | 1992-07-11 18:14 UTC | 5.7 | 34.96° N, 118.19° W 15km | US | VIII (568) | 0 | 0 | |
| 38 | 1992-11-27 16:00 UTC | 5.6 | 34.23° N, 117.01° W 5km | US | VII (4 k) | 0 | 0 | |
| 39 | 1993-05-17 23:20 UTC | 6.1 | 37.15° N, 117.82° W 10km | US | VIII (6) | 0 | 0 | |
| 40 | 1994-01-17 12:30 UTC | 6.7 | 34.16° N, 118.58° W 11km | US | IX (181 k) | 33 | 33 | landslide, liquefaction |
| 41 | 1994-01-17 23:33 UTC | 5.8 | 34.27° N, 118.79° W 8km | US | VIII (70 k) | 0 | 0 | |
| 42 | 1994-01-18 00:43 UTC | 5.5 | 34.26° N, 118.89° W 17km | US | VII (97 k) | 0 | 0 | |
| 43 | 1995-09-20 23:27 UTC | 5.5 | 35.63° N, 117.73° W 15km | US | VIII (852) | 0 | 0 | |
| 44 | 1999-10-16 09:46 UTC | 7.1 | 34.52° N, 116.44° W 5km | US | IX (17 k) | 0 | 0 | |
| 45 | 1999-10-16 09:59 UTC | 5.8 | 34.56° N, 116.79° W 9km | US | VIII (19) | 0 | 0 | |
| 46 | 1999-10-16 12:57 UTC | 5.7 | 34.27° N, 116.23° W 12km | US | VIII (201) | 0 | 0 | |
| 47 | 2001-12-08 23:36 UTC | 5.7 | 32.05° N, 114.9° W 9km | MX | VIII (72) | 0 | 0 | |
| 48 | 2002-02-22 19:32 UTC | 5.5 | 32.38° N, 115.19° W 9km | MX | VIII (8 k) | 0 | 0 | |
| 49 | 2003-12-22 19:15 UTC | 6.6 | 35.62° N, 121.07° W 16km | US | VII (213) | 2 | 2 | landslide, liquefaction |
| 50 | 2004-09-28 17:15 UTC | 6 | 35.75° N, 120.32° W 5km | US | VII (160) | 0 | 0 | |
| 51 | 2005-06-16 20:53 UTC | 4.9 | 33.95° N, 117.05° W 18km | US | VI (63 k) | 0 | 0 | |
| MMI | City | Population |
|---|---|---|
| IV | Signal Hill | 11k |
| III | Long Beach | 483k |
| III | Los Alamitos | 12k |
| III | Rossmoor | 11k |
| III | Lakewood | 82k |
| III | Seal Beach | 24k |
| III | Artesia | 17k |
| III | Hawaiian Gardens | 16k |
| III | Paramount | 57k |
| III | Cerritos | 53k |
| III | Bellflower | 76k |
| III | La Palma | 16k |
| II | Compton | 97k |
| II | Cypress | 47k |
| II | Norwalk | 109k |
| II | Westminster | 90k |
| II | East Compton | 10k |
| II | Stanton | 38k |
| II | Carson | 96k |
| II | Downey | 112k |
| II | West Carson | 22k |
| II | Lynwood | 72k |
| II | West Compton | 6k |
| II | Santa Fe Springs | 16k |
| II | Buena Park | 79k |
| II | Lomita | 21k |
| II | Cudahy | 26k |
| II | Garden Grove | 167k |
| II | South Gate | 100k |
| II | Willowbrook | 35k |
| II | Fountain Valley | 56k |
| II | La Mirada | 50k |
| II | Bell Gardens | 46k |
| II | Huntington Beach | 196k |
| I | East La Mirada | 10k |
| I | Villa Park | 6k |
| I | Bell | 38k |
| I | Gardena | 61k |
| I | Anaheim | 328k |
| I | South Whittier | 59k |
| I | Torrance | 145k |
| I | Rolling Hills | 2k |
| I | West Athens | 9k |
| I | Chino Hills | 67k |
| I | Costa Mesa | 109k |
| I | Newport Beach | 79k |
| I | Santa Ana | 343k |
| I | North Tustin | 24k |
| I | Yorba Linda | 65k |
| I | Walnut Park | 17k |
| I | Pico Rivera | 66k |
| I | Fullerton | 135k |
| I | Orange | 129k |
| I | Montebello | 64k |
| I | Placentia | 49k |
| I | Tustin | 69k |
| I | Alondra Park | 8k |
| I | Commerce | 14k |
| I | Irvine | 189k |
| I | Huntington Park | 64k |
| I | Maywood | 29k |
| I | Rolling Hills Estates | 8k |
| I | Westmont | 32k |
| I | East Los Angeles | 125k |
| I | La Habra | 60k |
| I | Belvedere | 2k |
| I | Brea | 40k |
| I | La Habra Heights | 6k |
| I | San Joaquin Hills | 3k |
| I | Fillmore | 15k |
| I | Acton | 3k |
| I | Adelanto | 18k |
| I | Agoura | 21k |
| I | Agoura Hills | 22k |
| I | Alhambra | 88k |
| I | Aliso Viejo | 41k |
| I | Altadena | 43k |
| I | Apple Valley | 64k |
| I | Arcadia | 57k |
| I | Avalon | 3k |
| I | Avocado Heights | 16k |
| I | Azusa | 48k |
| I | Baldwin Park | 81k |
| I | Beaumont | 19k |
| I | Beverly Hills | 35k |
| I | Big Bear Lake | 6k |
| I | Bloomington | 22k |
| I | Bonsall | 5k |
| I | Bradbury | 1k |
| I | Burbank | 105k |
| I | Calabasas | 21k |
| I | Calimesa | 8k |
| I | Camarillo | 63k |
| I | Canyon Lake | 12k |
| I | Carlsbad | 78k |
| I | Casa Conejo | 3k |
| I | Channel Islands Beach | 3k |
| I | Charter Oak | 9k |
| I | Cherry Valley | 6k |
| I | Chino | 75k |
| I | Citrus | 11k |
| I | Claremont | 35k |
| I | Colton | 52k |
| I | Corona | 153k |
| I | Coto De Caza | 19k |
| I | Covina | 49k |
| I | Crestline | 11k |
| I | Culver City | 40k |
| I | Dana Point | 36k |
| I | Del Mar | 4k |
| I | Del Aire | 10k |
| I | Desert View Highlands | 2k |
| I | Diamond Bar | 59k |
| I | Duarte | 23k |
| I | East Hemet | 14k |
| I | East Pasadena | 6k |
| I | East San Gabriel | 16k |
| I | El Cerrito | 5k |
| I | El Monte | 125k |
| I | El Rio | 6k |
| I | El Segundo | 17k |
| I | Encinitas | 58k |
| I | Escondido | 137k |
| I | Fallbrook | 34k |
| I | Fontana | 169k |
| I | Foothill Ranch | 12k |
| I | Glen Avon | 16k |
| I | Glendale | 195k |
| I | Glendora | 52k |
| I | Grand Terrace | 13k |
| I | Hacienda Heights | 54k |
| I | Hawthorne | 87k |
| I | Hemet | 69k |
| I | Hermosa Beach | 20k |
| I | Hesperia | 74k |
| I | Hidden Hills | 2k |
| I | Hidden Meadows | 4k |
| I | Highgrove | 4k |
| I | Highland | 51k |
| I | Hollywood | 168k |
| I | Home Gardens | 11k |
| I | Homeland | 4k |
| I | Inglewood | 116k |
| I | Irwindale | 2k |
| I | La Canada Flintridge | 21k |
| I | La Puente | 43k |
| I | La Verne | 34k |
| I | Ladera Heights | 7k |
| I | Laguna Beach | 24k |
| I | Laguna Hills | 31k |
| I | Laguna Niguel | 66k |
| I | Laguna Woods | 20k |
| I | Lake Arrowhead | 11k |
| I | Lake Elsinore | 41k |
| I | Lake Forest | 77k |
| I | Lake San Marcos | 4k |
| I | Lakeland Village | 6k |
| I | Lakeview | 2k |
| I | Las Flores | 6k |
| I | Las Flores | 6k |
| I | Lawndale | 33k |
| I | Lennox | 23k |
| I | Littlerock | 1k |
| I | Loma Linda | 21k |
| I | Los Angeles | 3,695k |
| I | Los Serranos | 7k |
| I | Malibu | 13k |
| I | Malibu Beach | 14k |
| I | Manhattan Beach | 37k |
| I | Marina del Rey | 9k |
| I | Mayflower Village | 5k |
| I | Meiners Oaks | 4k |
| I | Mentone | 9k |
| I | Mira Loma | 19k |
| I | Mira Monte | 7k |
| I | Mission Viejo | 96k |
| I | Monrovia | 38k |
| I | Montclair | 36k |
| I | Monterey Park | 63k |
| I | Moorpark | 37k |
| I | Moreno Valley | 169k |
| I | Mountain View Acres | 3k |
| I | Murrieta | 89k |
| I | Murrieta Hot Springs | 4k |
| I | Muscoy | 10k |
| I | Norco | 27k |
| I | North El Monte | 4k |
| I | North Glendale | 203k |
| I | Nuevo | 5k |
| I | Oak Park | 2k |
| I | Oak View | 5k |
| I | Oceanside | 161k |
| I | Ojai | 8k |
| I | Ontario | 173k |
| I | Oxnard | 170k |
| I | Oxnard Shores | 187k |
| I | Palmdale | 135k |
| I | Palos Verdes Estates | 14k |
| I | Pasadena | 145k |
| I | Pedley | 13k |
| I | Perris | 46k |
| I | Piru | 1k |
| I | Pomona | 156k |
| I | Port Hueneme | 21k |
| I | Portola Hills | 9k |
| I | Poway | 48k |
| I | Quail Valley | 2k |
| I | Rainbow | 2k |
| I | Rancho Cucamonga | 169k |
| I | Rancho Palos Verdes | 43k |
| I | Rancho Santa Fe | 3k |
| I | Rancho Santa Margarita | 51k |
| I | Redlands | 70k |
| I | Redondo Beach | 68k |
| I | Rialto | 102k |
| I | Riverside | 298k |
| I | Romoland | 3k |
| I | Rosemead | 56k |
| I | Rowland Heights | 52k |
| I | Rubidoux | 32k |
| I | Running Springs | 6k |
| I | San Antonio Heights | 3k |
| I | San Bernardino | 202k |
| I | San Clemente | 62k |
| I | San Dimas | 36k |
| I | San Fernando | 25k |
| I | San Gabriel | 42k |
| I | San Jacinto | 29k |
| I | San Juan Capistrano | 35k |
| I | San Marcos | 70k |
| I | San Marino | 13k |
| I | Santa Clarita | 169k |
| I | Santa Monica | 88k |
| I | Santa Paula | 29k |
| I | Sedco Hills | 3k |
| I | Sierra Madre | 11k |
| I | Simi Valley | 119k |
| I | Solana Beach | 13k |
| I | South El Monte | 22k |
| I | South Pasadena | 25k |
| I | South San Gabriel | 8k |
| I | South San Jose Hills | 22k |
| I | Sun City | 20k |
| I | Sunnyslope | 5k |
| I | Temecula | 85k |
| I | Temple City | 38k |
| I | Thousand Oaks | 128k |
| I | Trabuco Canyon | 3k |
| I | Upland | 74k |
| I | Val Verde | 1k |
| I | Valinda | 24k |
| I | Valley Center | 10k |
| I | Ventura | 97k |
| I | Victorville | 84k |
| I | Vincent | 15k |
| I | Vista | 93k |
| I | Walnut | 32k |
| I | West Covina | 110k |
| I | West Hollywood | 37k |
| I | West Puente Valley | 24k |
| I | Westlake Village | 9k |
| I | Westwood | 2k |
| I | Whittier | 86k |
| I | Wildomar | 16k |
| I | Winchester | 2k |
| I | Woodcrest | 9k |
| I | Wrightwood | 4k |
| I | Yucaipa | 50k |
(k = x1,000)
PAGER content is automatically generated, and only considers losses due to structural damage. Limitations of input data, shaking estimates, and loss models may add uncertainty. PAGER results are generally available 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 estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.
