1845 Nevado del Ruiz | |
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| Total costs | N/A |
| Deaths | 1000 |
The Nevado del Ruiz (Spanish pronunciation: [neβaðo ðel ˈrwis]), also known as La Mesa de Herveo (English: Mesa of Herveo, the name of the nearby town) is a volcano on the border of the departments of Caldas and Tolima in Colombia, about 129 kilometers (80 mi) west of the capital city Bogotá. It is a stratovolcano composed of many layers of lava alternating with hardened volcanic ash and other pyroclastic rocks. Volcanic activity at Nevado del Ruiz began about two million years ago, since the Early Pleistocene or Late Pliocene, with three major eruptive periods. The current volcanic cone formed during the present eruptive period, which began 150,000 years ago. The volcano usually generates Vulcanian to Plinian eruptions, which produce swift-moving currents of hot gas and rock called pyroclastic flows. These eruptions often cause massive lahars (mud and debris flows), which pose a threat to human life and the environment. The impact of such an eruption is increased as the hot gas and lava melt the mountain's snowcap, adding large quantities of water to the flow. On November 13, 1985, a small eruption produced an enormous lahar that buried and destroyed the town of Armero in Tolima, causing an estimated 25,000 deaths. This event later became known as the Armero tragedy—the deadliest lahar in recorded history. Similar but less deadly incidents occurred in 1595 and 1845, consisting of a small explosive eruption followed by a large lahar. The volcano is part of Los Nevados National Natural Park, which also contains several other volcanoes. The summit of Nevado del Ruiz is covered by large glaciers. The volcano continues to pose a threat to the nearby towns and villages, and it is estimated that up to 500,000 people could be at risk from lahars from future eruptions. Today, the Nevado del Ruiz volcano is constantly monitored by the Volcanic and Seismic Observatory of Manizales.
Source: Wikipedia 1989 Loma Prieta earthquake | |
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| Total costs | 6000000000 paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid paid |
| Deaths | 63 |
The 1989 Loma Prieta earthquake occurred on California's Central Coast on October 17 at 5:04 p.m. local time. The shock was centered in The Forest of Nisene Marks State Park in Santa Cruz County, approximately 10 mi (16 km) northeast of Santa Cruz on a section of the San Andreas Fault System and was named for the nearby Loma Prieta Peak in the Santa Cruz Mountains. With an Mw magnitude of 6.9 and a maximum Modified Mercalli intensity of IX (Violent), the shock was responsible for 63 deaths and 3,757 injuries. The Loma Prieta segment of the San Andreas Fault System had been relatively inactive since the 1906 San Francisco earthquake (to the degree that it was designated a seismic gap) until two moderate foreshocks occurred in June 1988 and again in August 1989. Damage was heavy in Santa Cruz County and less so to the south in Monterey County, but effects extended well to the north into the San Francisco Bay Area, both on the San Francisco Peninsula and across the bay in Oakland. No surface faulting occurred, though many other ground failures and landslides were present, especially in the Summit area of the Santa Cruz Mountains. Liquefaction was also a significant issue, especially in the heavily damaged Marina District of San Francisco, but its effects were also seen in the East Bay, and near the shore of Monterey Bay, where a non-destructive tsunami was also observed.Because it happened during a national live broadcast of the 1989 World Series, taking place between Bay Area teams San Francisco Giants and the Oakland Athletics, it is sometimes referred to as the 'World Series earthquake', with the championship games of the year being referred to as the 'Earthquake Series'. Rush-hour traffic on the Bay Area freeways was lighter than normal because the game, being played at Candlestick Park in San Francisco, was about to begin, and this may have prevented a larger loss of life, as several of the Bay Area's major transportation structures suffered catastrophic failures. The collapse of a section of the double-deck Nimitz Freeway in Oakland was the site of the largest number of casualties for the event, but the collapse of man-made structures and other related accidents contributed to casualties occurring in San Francisco, Los Altos, and Santa Cruz.
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