Greater Los Angeles, also called the Southland, with a 2019 population of 18,710,563, is the second-largest urban region area in the United States, encompassing five counties in southern California extending from Ventura County in the west to San Bernardino County and Riverside County in the east, with Los Angeles County in the center and Orange County to the southeast. According to the U.S. Census Bureau, the Los Angeles–Anaheim–Riverside combined statistical area covers 33,954 square miles (87,940 km2), making it the largest metropolitan region in the United States by land area. However, more than half of this area lies in the sparsely populated eastern areas of Riverside and San Bernardino counties. In addition to being the nexus of the world's largest entertainment industry, Greater Los Angeles is also a global center of business, international trade, education, media, fashion, tourism, science and technology, sports, and transportation. It is the 3rd largest metropolitan area by nominal GDP in the world with an economy exceeding $1 trillion in output.
There are three contiguous component metropolitan areas in Greater Los Angeles: the Inland Empire, which can be broadly defined as Riverside and San Bernardino counties; the Ventura/Oxnard metropolitan area (or Ventura County); and the Los Angeles metropolitan area (also known as Metropolitan Los Angeles or Metro LA) consisting of Los Angeles and Orange counties only. The Census Bureau designates the latter as the Los Angeles–Long Beach–Anaheim metropolitan statistical area, the fifth largest metropolitan area in the western hemisphere and the second-largest metropolitan area in the United States, with a total area of 4,850 square miles (12,561 km2). San Diego–Tijuana, though contiguous with Greater Los Angeles at San Clemente and Temecula, is not part of it, but together both form part of the Southern CaliforniaMegalopolis.
Throughout the 20th century, Greater Los Angeles was one of the fastest-growing regions in the United States, but growth has slowed since 2000. As of the 2010 U.S. Census, the smaller Los Angeles metro area had a population of nearly 13 million residents. In 2015, the Greater Los Angeles population was estimated to be about 18.7 million, making it the second largest metropolitan region in the country, behind New York, as well as one of the largest megacities in the world. (Full article...)
The Northridge earthquake occurred on January 17, 1994, at 04:31 a.m. Pacific Standard Time and was centered in Reseda, a neighborhood in the north-central San Fernando Valley region of Los Angeles, California. It had a duration of approximately 10–20 seconds. The earthquake had a "strong" moment magnitude (Mw) of 6.7, but the ground acceleration was one of the highest ever instrumentally recorded in an urban area in North America, measuring 1.8g (16.7 m/s2) with strong ground motion felt as far away as Las Vegas, Nevada, about 220 miles (360 km) from the epicenter. The peak ground velocity in this earthquake at the Rinaldi Receiving station was 183 cm/s (4.09 mph or 6.59 km/h), the fastest peak ground velocity ever recorded. In addition, two 6.0 Mwaftershocks occurred, the first about one minute after the initial event and the second approximately 11 hours later, the strongest of several thousand aftershocks in all. The death toll was 57, with more than 5,000 injured. In addition, earthquake-caused property damage was estimated to be more than $20 billion, making it one of the costliest natural disasters in U.S. history.