2008_Chino_Hills_earthquake

From Wikipedia, the free encyclopedia 2008 Chino Hills earthquake 2008 Chino Hills earthquake 2008 Chino Hills earthquake Tectonics The Chino Hills earthquake was caused by thrust and sinistral strike-slip faulting.[1] Preliminary reports cited the Whittier fault as the active cause, but the quake was later determined to have been generated by the "Yorba Linda trend," as identified by Caltech seismologist Egill Hauksson.[2] Its epicenter was within 3 miles (4.8 km) of Chino Hills and its hypocenter was approximately 9.1 miles (14.6 km) deep.[1] Initial estimations of the moderate main shock reported it as magnitude 5.8, but this was later revised to magnitude 5.4[3][4] and in later months to a 5.5.[5] The main shock was reportedly felt as far south as San Diego, and Tijuana, Mexico,[3][6] and as far east as Las Vegas, Nevada.[1][7] It was the strongest earthquake to occur in the greater Los Angeles area since the 1994 Northridge earthquake.[6][8] As reported by The Orange County Register, three microquakes, all less than magnitude 3.0, occurred in Anaheim Hills, 7 miles (11 km) southwest of Chino Hills, two months before the Chino Hills earthquake.[9] There was an unusually low amount of seismic activity in Southern California in the week prior to the quake. Between July 20 and July 26, 2008, there were no earthquakes in Southern California exceeding magnitude 3.0, thus there was speculation that the wane in seismic activity was a precursor to a possible larger event.[10] Date Magnitude Depth: Epicenter location: Countries/ regions affected Aftershocks: July 29, 2008 5.5 Mw 9.1 miles (14.6 km) 33°57′11″N 117°45′40″W / 33.953°N 117.761°W / 33.953; -117.761 United States (Southern California) ~100 The 2008 Chino Hills earthquake occurred at 11:42:15 am PDT (18:42:15 UTC) on July 29, 2008, in Southern California.[1] The epicenter of the magnitude 5.5 earthquake was in Chino Hills, approximately 28 miles (45 km) east-southeast of downtown Los Angeles.[1] Though no lives were lost during the earthquake, it caused considerable damage in numerous structures throughout the area and caused some amusement park facilities to shut down their rides. The earthquake led to increased discussion regarding the possibility of a stronger earthquake in the future. Impact The Chino Hills earthquake caused no deaths or significant damage due to the physical location of its epicenter.[11] Most of the infrastructure in the Chino Hills area is relatively new and well suited to withstand a large quake.[4][7] Unlike previous earthquakes in the region—such as the 1994 Northridge earthquake and the 1987 Whittier Narrows earthquake, which caused serious structural damage and fatalities—this quake caused only minor damage.[7] However, the high volume of telephone use following the shock 1 From Wikipedia, the free encyclopedia 2008 Chino Hills earthquake The earthquake knocked down merchandise inside buildings such as this Yorba Linda grocery store. overloaded provider capacity and disrupted service into the afternoon.[12] Amusement rides at Disneyland, Six Flags Magic Mountain, Universal Studios Hollywood and Knott’s Berry Farm were evacuated and temporarily shut down.[13][14] California State University, Fullerton suffered some damage in its older, inadequately engineered buildings.[13] In Orange, the Chapman University School of Law was evacuated after a water pipe was ruptured.[14][15] Pipes on a Macy’s department store in Westfield Topanga ruptured during the tremor flooding the store which closed for a couple of days in order to be repaired. A light fixture damaged by the shock started a small fire in the Westfield MainPlace Mall in Santa Ana; since the fire was in an empty movie theater, nobody was harmed.[14] A gap was reported on California State Route 91 near Anaheim Hills, approximately 7 miles (11 km) southwest of the epicenter, but the California Department of Transportation concluded that the gap did not pose a danger.[14] A minor landslide near the freeway caused some traffic congestion, but no injuries or structural damage were reported.[14] Caltrans replaced an expansion joint on an Interstate 5 truck overpass at the El Toro Y Interchange.[14] The roof of Placentia’s public library nearly collapsed; afterwards, the building was closed for repairs.[14] Electrical outages were reported in Chino, Chino Hills, Diamond Bar and Pomona.[16][17] Over 2,000 people lost power after a fire broke out at a La Habra power station, but electricity was restored that afternoon.[14] Earthquake damage at South Coast Plaza in Costa Mesa. Los Angeles International Airport reported a ground radar system outage along with a broken water heater, causing flooding in the checked luggage preparation area of Terminal 7.[7][18] Minor injuries from falling ceiling tiles were reported at a medical clinic in Brea.[14] Aftershocks Approximately 100 minor aftershocks and one presumed foreshock were reported within two days after the Chino Hills earthquake,[19] 27 of which occurred within an hour after the quake.[20] Four aftershocks of at least 3.0 in magnitude were reported—the first, nine minutes following the initial earthquake, was the largest at magnitude 3.8;[19] and two others, occurring over two hours later, were recorded at magnitude 3.6.[21] Twenty-eight aftershocks of at least 2.0 were reported.[21] One presumed foreshock, magnitude 1.3, occurred sixteen hours prior to the earthquake in the same location as the main shock.[22] Response There was speculation that the Chino Hills earthquake may have been a foreshock to a larger earthquake.[23] The Southern California Seismic Network’s Aftershock Probability Report, produced minutes after the event, stated that "Most likely, the recent mainshock will be the largest in the sequence. However, there is a small chance, approximately 5–10%, of an earthquake equal to or larger than this mainshock in the next 7 days."[24] 2 From Wikipedia, the free encyclopedia Geologists at the United States Geological Survey and Uniform California Earthquake Rupture Forecast suggest that an earthquake with a magnitude of 6.7 or larger will almost definitely occur somewhere in the state within the next 30 years.[25] California Governor Arnold Schwarzenegger said: "This earthquake reminds us to be prepared. [...] We were very fortunate that there were no serious injuries or property damage."[18] Additionally, registration for the Great Southern California ShakeOut, a regional earthquake drill scheduled to occur on Nov. 13, 2008, increased significantly in the aftermath of the earthquake.[19] 2008 Chino Hills earthquake [5] http://earthquake.usgs.gov/eqcenter/ eqinthenews/2008/ci14383980/ [6] ^ Steinhauer, Jennifer (2008-07-29). "Earthquake Rattles Southern California". New York Times (New York Times Company). http://www.nytimes.com/2008/07/30/us/ 30quake.html?hp. Retrieved on 2008-07-29. [7] ^ Rubin, Joel; Pierson, David; Landsberg, Mitchell (2008-07-29). "Minor damage from 5.4 quake shows California has learned its lessons". Los Angeles Times. http://www.latimes.com/news/local/lame-laquake30-2008jul30,0,6284507.story. Retrieved on 2008-07-29. [8] Jablon, Robert (2008-07-29). "Strong • List of earthquakes in the United States quake rattles buildings, nerves in S. Calif.". Associated Press via Yahoo! News. http://news.yahoo.com/s/ap/ 20080729/ap_on_re_us/ [1] ^ "Magnitude 5.5 - Greater Los Angeles california_earthquake. Retrieved on Area, California". USGS. 2008-07-29. http://earthquake.usgs.gov/eqcenter/ [9] Robbins, Gary (2008-05-24). "Third eqinthenews/2008/ci14383980/. microquake shakes Anaheim Hills". The Retrieved on 2008-07-29. Orange County Register. Orange County [2] Robbins, Gary (2007-07-31). "Little Register Communications. known Yorba Linda fault caused http://sciencedude.freedomblogging.com/ Tuesday’s quake". The Orange County 2008/05/24/third-microquake-shakesRegister. Orange County Register anaheim-hills/. Retrieved on 2008-07-29. Communications. [10] Robbins, Gary. "Southern California http://sciencedude.freedomblogging.com/ Quake Activity Continues Odd Down 2008/07/31/little-known-yorba-lindaTurn". The Orange County Register. fault-caused-tuesdays-quake/. Retrieved Orange County Register on 2008-08-01. Communications. [3] ^ "What’s Making Judge Judy Quake?". http://sciencedude.freedomblogging.com/ Sky News. 2008-07-30. southern-california-quake-activityhttp://news.sky.com/skynews/Home/ continues-odd-down-turn/. Retrieved on World-News/Earthquake2008-07-29. Of-54-Magnitude-Shakes-Southern[11] "Strong Earthquake Hits Southern California-Although-No-Injuries-AreCalifornia". CBC News. Canadian Reported/Article/200807415060001. Broadcasting Corporation. 2008-07-29. Retrieved on 2008-07-30. http://www.cbc.ca/world/story/2008/07/ [4] ^ "Tougher codes kept quake damage 29/quake-california.html. Retrieved on down". CNN. 2008-07-30. 2008-07-29. http://www.cnn.com/2008/US/07/30/ [12] Colker, David (2008-07-30). "Post-quake earthquake.ca/index.html. Retrieved on callers overload phone systems". Los 2008-07-30. Flaccus, Gillian Angeles Times. http://www.latimes.com/ (2008-07-30). "Strict building codes news/local/la-mecredited after Calif. quake". Associated phones30-2008jul30,0,854202.story. Press. http://ap.google.com/article/ Retrieved on 2008-08-02. ALeqM5g[13] ^ "What’s closed, delayed after the JQC5ESySZKfb7WpG_XRBRxNNYwD928FRQO0.quake". Los Angeles Times. 2008-07-29. Retrieved on 2008-08-21. http://www.latimes.com/news/local/lame- See also References 3 From Wikipedia, the free encyclopedia 2008 Chino Hills earthquake assessmentquake30-2008jul30,0,4614179.story. http://earthquake.usgs.gov/eqcenter/ Retrieved on 2008-07-30. recenteqsus/Maps/US2/ [14] ^ Irving, Doug (2008-07-29). "O.C. 33.35.-119.-117_eqs.php. Retrieved on QUAKE ROUNDUP: Disney rides down, 2008-07-30. trains disrupted, small landslide [22] "Magnitude 1.3 - Greater Los Angeles reported". The Orange County Register Area, California". USGS. (Orange County Register http://earthquake.usgs.gov/eqcenter/ Communications). recenteqsus/Quakes/ci14383136.php. http://www.ocregister.com/articles/fontRetrieved on 2008-07-30. shaking-2108278. Retrieved on [23] Whitcomb, Dan (2008-07-30). 2008-07-29. "Earthquake jolts lucky Los Angeles". [15] Fisher, Marla Jo (2008-07-29). "College Reuters. http://uk.reuters.com/article/ earthquake updates". The Orange wtMostRead/ County Register. Orange County idUKN2935724120080730?sp=true. Register Communications. Retrieved on 2008-07-30. See also: http://collegelife.freedomblogging.com/ Becerrea, Hector; Pierson, David 2008/07/29/college-earthquake-updates/. (2008-07-31). "Experts see quake as Retrieved on 2008-08-21. ’teachable moment’". Los Angeles Times. [16] "5.4 earthquake strikes Los Angeles". http://www.latimes.com/news/ Chicago Tribune. 2008-07-29. printedition/california/la-mehttp://www.chicagotribune.com/news/ quake31-2008jul31,0,2595229,full.story. nationworld/chi-los-angelesRetrieved on 2008-08-21. earthquake-080729-ht,0,5977819.story. [24] "Aftershock Probability Report". Retrieved on 2008-08-15. Southern California Seismic Network. [17] "5.4 quake strikes near Los Angeles". July 29, 2008. http://www.scsn.org/ ABC News. 2008-07-29. forecast/14383980.html. Retrieved on http://abclocal.go.com/kabc/ 2008-07-30. story?section=news/local&id=6294236. [25] USGS (2008-04-15). "California Has Retrieved on 2008-07-29. More Than 99% Chance Of A Big [18] ^ "Expert: L.A.’s 5.4 quake ’small Earthquake WIthin 30 Years, Report sample’ of one to come". CNN. Shows". ScienceDaily. 2008-07-30. http://www.cnn.com/2008/ http://www.sciencedaily.com/releases/ US/07/29/earthquake.ca/index.html. 2008/04/080414203459.htm. Retrieved Retrieved on 2008-08-21. on 2008-07-30. See also: Field, Edward; [19] ^ Pierson, David (2008-07-31). "Will Milner, Kevin; 2007 Working Group on Chino Hills earthquake shake L.A. out of California Earthquake Probabilities complacency?". Los Angeles Times. (2008) (PDF). Forecasting California’s http://articles.latimes.com/2008/jul/31/ Earthquakes—What Can We Expect in local/me-quake31. Retrieved on the Next 30 Years?. 1.0. USGS. 2008-08-02. See also: United States http://pubs.usgs.gov/fs/2008/3027/ Geological Survey (2008-07-30) (HTML). fs2008-3027.pdf. Southern Californians Urged to Join Largest Earthquake Drill in U.S. History. Press release. http://www.usgs.gov/ • Chino Hills earthquake on USGS newsroom/article.asp?ID=1983. • Gliaster, Dan (2008-08-04). "Apocalypse Retrieved on 2008-07-30. but not right now. How California stays [20] Maugh II, Thomas (2008-07-30). "Quake cool about the Big One". guardian.co.uk. originated about eight miles under Chino http://www.guardian.co.uk/world/2008/ Hills". Los Angeles Times. aug/04/naturaldisasters.usa?gusrc=rss. http://www.latimes.com/news/local/la-sciquake30-2008jul30,0,7281322.story. Retrieved on 2008-07-30. [21] ^ "Earthquake List for Map Centered at 34°N, 118°W". USGS. External links Retrieved from "http://en.wikipedia.org/wiki/2008_Chino_Hills_earthquake" 4 From Wikipedia, the free encyclopedia 2008 Chino Hills earthquake Categories: 2008 earthquakes, 2008 in the United States, Earthquakes in California This page was last modified on 14 May 2009, at 18:53 (UTC). All text is available under the terms of the GNU Free Documentation License. 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