Pacoima Canyon Pegmatite (California) - Rocking with the Rocks
The Pacoima Canyon pegmatite is a legendary mineral locality. It boasts some of the finest allanite crystals in the world, as well as unusually large zircon crystals, huge crystalline biotite clots, gigantic hornblende crystals (some up to several feet long), and abundant massive pink potassium feldspar crystals.
Seismically induced rock slope failures resulting from ...
2005年8月30日 · The 1994 Northridge earthquake (M w = 6.7) triggered extensive rock slope failures in Pacoima Canyon, immediately north of Los Angeles, California. Pacoima Canyon is a narrow and steep canyon incised in gneissic and granitic rocks.
Anomalous concentrations of seismically triggered rock falls ...
Anomalously high concentrations of rock falls were triggered in Pacoima Canyon (Los Angeles, California) during the 1994 Northridge earthquake. Similar concentrations were also documented from the 1971 San Fernando earthquake.
Pacoima Canyon, Los Angeles Co., California, USA - mindat.org
Description: Occurs as abundant rough tabular crystals & grains to 2 or 3 inches (5.0-7.5 cm) in a pegmatite.
CSMIP 00-05 - California Department of Conservation
Study of the CDMG processed records of Pacoima Dam in the 1994 Northridge earthquake and comparison with the analytical results from the models indicated the following conclusions: (i) The contraction joints opened during the earthquake, and the effect of the joint opening is an important factor in the response; (ii) the non-uniform free-field ...
Pacoima Dam is a 113m high concrete arch dam located north of the city of Los Angeles. A well known ground motion record obtained above the south abutment during the 1971 San Fernando earthquake showed large accelerations of 1.25g horizontal and 0.70g vertical which have been attributed to topographical amplification. A more
FindingRocks.com - Pacoima Canyon Pegmatite
This website is dedicated to the amateur rockhound who is interested in finding rock specimens for their collection. It includes information such as collecting locations that I've visited or that I've researched, and also information from other rockhounds.
Pacoima Dam, is to develop rules for prescribing nonuniform seismic input in safety assessment analyses of dams. Based on the data presented here, one could propose that time delay be a function of elevation and shear wave speed in the rock to account for travel time of …
Pacoima Dam provides crucial water conservation and flood protection for the Cities of Los Angeles and San Fernando. It is located approximately 4 miles north of the 210 Freeway in Sylmar.
Dutch Louie Tunnel - angelesadventures.com
2015年5月7日 · Down in Pacoima Creek sits a crumbling tunnel from the 19th century that stands testament to the era of ambitious mining in the San Gabriels. Gold, silver, titanium, and graphite were all mined in Pacoima canyon. The old prospector known as Dutch Louie discovered gold placers along the streambed.