Natural dam produced directly or indirectly by volcanism
The edge of The Barrier in British Columbia, Canada.
A volcanic dam is a type of natural dam produced directly or indirectly by volcanism, which holds or temporarily restricts the flow of surface water in existing streams, like a man-made dam. There are two main types of volcanic dams, those created by the flow of molten lava, and those created by the primary or secondary deposition of pyroclastic material and debris. This classification generally excludes other, often larger and longer lived dam-type geologic features, separately termed crater lakes, although these volcanic centers may be associated with the source of material for volcanic dams, and the lowest portion of its confining rim may be considered as such a dam, especially if the lake level within the crater is relatively high.
Volcanic dams generally occur worldwide, in association with former and active volcanic provinces, and are known to have existed in the geologic record, in historic times and occur in the present day. Their removal or failure is similarly recorded. The longevity, and extent varies widely, having periods ranging from a few days, weeks or years to several hundred thousand years or more, and dimensions ranging from a few meters to hundreds, to several thousand.
The emplacement, internal structure, distribution and longevity of such dams can be related variously to the amount, rapidity and duration of (primary) geothermal energy released, and the rock material made available; other considerations include the rock types produced, their physical and toughness characteristics, and their various modes of deposition. Depositional modes include gravity flow of molten lava at the surface, gravity flow or fall of pyroclastics through the air, as well as the redistribution and transportation of those materials by gravity and water.
A volcanicdam is a type of natural dam produced directly or indirectly by volcanism, which holds or temporarily restricts the flow of surface water in...
contained only by its adjacent natural volcanicdam; continued leakage through or surface outflow across the dam can erode its included material, thus...
from a volcanic vent piled up in a conical shape Volcanic crater – Roughly circular depression in the ground caused by volcanic activity Volcanicdam – Natural...
flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity. A volcanicdam impounds the lake waters. A pocket of...
inferred from geomorphological evidence on Mars. Landslides, lahars, and volcanicdams can also block rivers and create lakes, which trigger such floods when...
The Bridge River Vent is a volcanic crater in the Pacific Ranges of the Coast Mountains in southwestern British Columbia, Canada. It is located 51 km (32 mi)...
and sea birds. One of the best places for sightseeing and camping is a volcanicdam that is located in the middle of broad sand flats not far from Khalouf...
landslide dam or barrier lake is the natural damming of a river by some kind of landslide, such as a debris flow, rock avalanche or volcanic eruption....
would be the eruptions of the Uinkaret volcanic field about 1.8 million–10,000 years ago, which created lava dams on the Colorado River in northern Arizona...
The Barrier is a lava dam retaining the Garibaldi Lake system in southwestern British Columbia, Canada. It is over 300 m (980 ft) thick and about 2.4 km...
instead water is retained by damming Miocene volcanic deposits. Soils of the basin come primarily from andesitic volcanic rocks and granodiorite, with...
Cascade Volcanoes (also known as the Cascade Volcanic Arc or the Cascade Arc) are a number of volcanoes in a volcanic arc in western North America, extending...
lake is a lake formed as a result of volcanic activity. They are generally a body of water inside an inactive volcanic crater (crater lakes) but can also...
The Mount Edziza volcanic complex (MEVC) in British Columbia, Canada, has a long history of volcanism that spans more than six million years. It occurred...
A volcanic landslide or volcanogenic landslide is a type of mass wasting that takes place at volcanoes. All volcanic edifices are susceptible to landslides...
A beaver dam or beaver impoundment is a dam built by beavers; it creates a pond which protects against predators such as coyotes, wolves and bears, and...
group of volcanic peaks in the Pacific Ranges of the Coast Mountains in southwestern British Columbia, Canada. Part of the Cascade Volcanic Arc of western...
Andes Austral Volcanic Zone South Volcanic Zone Central Volcanic Zone North Volcanic Zone Central America Volcanic Arc Trans-Mexican Volcanic Belt North...
The Garibaldi Volcanic Belt is a northwest–southeast trending volcanic chain in the Pacific Ranges of the Coast Mountains that extends from Watts Point...
are triggered by primary volcanic activity. 'Secondary' or 'post-eruptive' lahars occur in the absence of primary volcanic activity, e.g. as a result...
Nagarjuna Sagar Dam is a masonry dam across the Krishna River at Nagarjuna Sagar which straddles the border between Palnadu district in Andhra Pradesh...
active stratovolcano at the southern end of the Taupō Volcanic Zone and North Island volcanic plateau in New Zealand. It is 23 km (14 mi) northeast of...
late-Cenozoic volcanic rock, is 1.9 million years old. The dam site is composed of basalt and rhyolite, both of which are considered unsuitable for dam construction[citation...
Long Valley Dam by the Los Angeles Department of Water and Power (DWP), as storage for the Los Angeles Aqueduct and for flood control. The dam is 126 ft...
sources of elevated carbon dioxide concentration in groundwater are soil and volcanic activity. Water passing through soil picks up carbon dioxide from plant...
Sumatra Island and Tangkuban Perahu in Java - picked up an increase in volcanic activity and a build-up of gases, said government volcanologist Syamsul...
Global Information