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Loma Prieta, California, Earthquake October 17, 1989. Extension cracks in the Marina District of San Francisco formed by the lateral spreading of a liquefied sandy landfill. Figure 25, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Site of the Yungay plaza showing the remains of the cathedral walls and four palm trees buried to a depth of 5 meters. The ridge that was overtopped by the Yungay debris lobe is visible in the distance. The wreckage in the right middle ground consists of a smashed bus and truck. June-July 1970.
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Peru Earthquake May 31, 1970. Nevados Hascaran, showing the area overrun by the upper part of the debris avalanche (outlined by dashed line): Moraines, M, below Glacier 511 and between Rio Shacsha and Quebrada Armapampa, and areas splattered by airborn mud and boulders. June-July 1970.
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Loma Prieta, California, Earthquake October 17, 1989. Crack system near Summit Road, half a mile southwest of Highway 17. View is northwest. A wide zone of dominantly extensional cracks passes several feet in front of the house. Figure 10-A, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Damage from the flood wave at the power company camp near Huallanca, which is visible in background. The wave, 20 meters deep at this point, swept away homes that formerly covered the level area in this view and deposited a layer of mud and rocks. The fence posts in the foreground are bent in the direction of the flow. June-July 1970.
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Loma Prieta, California, Earthquake October 17, 1989. Structures damaged in the Marina District of San Franciso. Damage due to ground failure of liquefied fill. Figure 24A, U.S. Geological Survey Circular 1045.
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Loma Prieta, California, Earthquake October 17, 1989. Crack system near Summit Road, half a mile southwest of Highway 17. View is southeast toward a house showing the driveway dropped down relative to the garage. Figure 10-B, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Flooding of a residential area in southeastern Chimbote where the ground settled substantially because of compaction of water- saturated sediments. 1971.
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Loma Prieta, California, Earthquake October 17, 1989. Sand boils formed by liquefaction in the Marina District of San Francisco. Figure 26, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Subsidence of a roadway fill adjacent to the iron ore unloading dock in Chimbote. The fill settled into the weak underlying sediments approximately 1.2 meters at this locality. The dock, which rests on piles driven through the unconsolidated surficial deposits, did not subside. June-July 1970.
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Loma Prieta, California, Earthquake October 17, 1989. Scarps and cracks associated with the movement of deep-seated slumps. Scarp at the head of a block slide in a residential area of Brookdale in the Santa Cruz Mountains. The block slide moved approximately 1.5 feet downslope (to the right). Part of the house to the left of the scarp remained on undisturbed ground while the part to the right moved downslope on a slide block. Figure 22, U.S. Geological Survey Circular 1045.
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Loma Prieta, California, Earthquake October 17, 1989. Larger of the two cracks that broke Morrill Road by left-lateral motion in both the 1906 San Francisco earthquake and 1989 Loma Prieta earthquake. The view of present-day Morrill Road is similar to 1906 view after the asphalt road had been patched, showing left-lateral displacement of the edge of the road. October 1989. Figure 13-C, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Part of a fishmeal plant at the Port of Casma that was severely cracked as a result of lateral spreading of the underlying unconsolidated sediments and fill. Note the extension effect on the concrete floor slabs. June-July 1970.
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Loma Prieta, California, Earthquake October 17, 1989. Sand boils at Oakland International Airport. Figure 28, U.S. Geological Survey Circular 1045.
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Loma Prieta, California, Earthquake October 17, 1989. Collapsed Cypress viaduct of Interstate 880 in Oakland. The second deck collapsed onto the first deck. Figure 30A, U.S. Geological Survey Circular 1045.
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Loma Prieta, California, Earthquake October 17, 1989. Sand boils in irrigated fields near Hollister. Figure 29, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Block of granodiorite estimated to weigh about 7,000 metric tons that was transported by the Huascaran debris avalanche and deposited near the Rio Santa west of Ranrahirca. The top of the block is covered with boulders that were deposited from the debris flow after the block came to rest. This block was left exposed after the enclosing mud flowed and/or was washed away after the avalanche. The pole at the base of the block is 4 meters high. June-July 1970.
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Loma Prieta, California, Earthquake October 17, 1989. Cracks through a corral near Summit Road, about 1.1 miles southeast of Highway 17, along the southwest edge of an elongate, closed depression. Cracks are also found along the northeast edge of the same depression. Displacements on both sets of cracks deepened the depression. Figure 11, U.S. Geological Survey Circular 1045.
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Peru Earthquake May 31, 1970. Fragmentation of thin saline-cemented crust due to earthquake shaking of a soil mound in the desert inland from Casma. 1970
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Loma Prieta, California, Earthquake October 17, 1989. Small rockfall deposit at a road cut, typical of those caused throughout the Santa Cruz Mountains. Figure 21, U.S. Geological Survey Circular 1045.
map background search result map search result map Nevados Hascaran avalanche showing the area overrun by the upper part of the debris avalanche (outlined by dashed line) caused by the Peru Earthquake. 1970. Nevados Hascaran avalanche showing the area overrun by the upper part of the debris avalanche (outlined by dashed line) caused by the Peru Earthquake. 1970.