Sentences with phrase «of pyroclastic»

The images show that the axial valley at 4,000 m water depth is blanketed by an extensive set of pyroclastic deposits, raising important questions regarding the accumulation and discharge of magmatic volatiles on such ridges and demonstrating that large - scale pyroclastic activity is possible along even the deepest portions of the global mid-ocean ridge volcanic system.

During the New horizons flyby of Jupiter the volcano Tvashtar was imaged with a plume height varying between roughly 320 and 360 km and a full width of about 1,100 km, consistent with the diameter of the pyroclastic deposits.

The combined effects of pyroclastic flows, volcanic ashes and tsunamis had disastrous results in the region.

The age of each crater offers an important constraint in the age of the pyroclastic deposit inside it: The deposit has to be younger than its host crater.

Those glimpses of the surface revealed deposits of pyroclastic ash — the telltale signs of volcanic explosions — peppering the planet's surface.

And the flows can travel at incredibly high speeds down the sides of a volcano; an estimate of the average speed of the pyroclastic flow down the slopes of Mount Saint Helens in Washington State during its 1980 eruption (also Plinian) was around 230 kilometers per hour.

Scientists are now watching to see whether the volcano repeats the violent eruptions of 1963, when superheated gases and volcanic material raced down the mountain in a series of pyroclastic flows, killing more than 1000 people.

Not exact matches

The maroon patch within the baby - blue area at the center of the crater signifies what has been identified as pyroclastic deposits centering on a volcanic vent.

Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite.

The entire cliff would have been deposited very quickly from a fast - moving current of hot gas and ash (a pyroclastic density current), and the extreme temperatures (900-1000 °C) caused the ash to weld to the ground and effectively enameled the area in dense volcanic glass.

One possibility is that the eruption column of hot volcanic ash, gas and rock fragments now extending into the sky above the summit could collapse into what's called a pyroclastic flow and race down the flanks of the mountain.

They examined 130 outcrops on the flanks of the volcano, exposing sequences of pumice — ash hardened into rock — and other pyroclastic material.

The team also performed radiocarbon analyses on carbonized tree trunks and branches buried within the pyroclastic deposits to confirm the date of the eruption; it could not, they concluded, have happened before 1257 C.E., and certainly happened in the 13th century.

According to Babad Lombok, records of the island written on palm leaves in Old Javanese, Samalas erupted catastrophically before the end of the 13th century, devastating surrounding villages — including Lombok's capital at the time, Pamatan — with ash and fast - moving sweeps of hot rock and gas called pyroclastic flows.

After a wave of hot gas and ash, called a pyroclastic flow, engulfed nearby Pompeii and killed those left in the city, more layers of ash from the eruption buried the buildings and bodies.

«At Kima'Kho, we were able to map a passage zone in pyroclastic deposits left by the earliest explosive phase of eruption, allowing for more accurate forensic recovery of paleo - lake levels through time and better estimates of paleo - ice thicknesses,» says UBC volcanologist James K Russell, lead author on the paper published this week in Nature Communications.

So the age of the crater provides an upper limit on how old the pyroclastic deposit can be.

A team of researchers led by Tim Goudge, a graduate student in the Department of Geological Sciences at Brown, looked at 51 pyroclastic sites distributed across Mercury's surface.

Measuring geological time: Two pyroclastic vents on the floor of Mercury's Kipling crater, top, would likely not have survived the impact; they are more recent.

«We hope our discovery encourages more researchers to seek out pyroclastic passage zones,» says Lucy Porritt, a Marie Curie Research Fellow at UBC and University of Bristol.

The lava erupted explosively in shallow waters producing large volumes of a glassy pyroclastic rock called hyaloclastite.

«The magma that originally erupted from the supervolcano had about 1,400 ppm lithium in it,» said Benson, describing a red - hot pyroclastic flow of pumice, ash, crystals, and rock that spread for 50 miles in all directions.

The Pompeii and circumstance of billowing ash, earthquakes, flaming meteors, tsunami, and pyroclastic flow (look it up) finally adds some liveliness to otherwise steady genericalness, but the poignancy - free special - effects spectacle isn't insanely intense, as it should be, instead evoking green screens and video games.

«I've skipped all other reading in favor of this enthralling world of loyalty, betrayal, and pyroclastic flows.»

Volcanologists warn that the main hazards of a large eruption are hot and fast - moving avalanches of rocks, dust and gas that can not be outrun, known as pyroclastic flows, as well as mudflows and ashfall.

Worst possible scenario involves pyroclastic flows — currents of hot gas and rock moving at 70 miles per hour

Leading theories include lava channels, collapsed lava tubes, near - surface dike intrusion, nuée ardente (pyroclastic cloud), subsidence of lava - covered basin and crater floors, and tectonic extension.

Mount Sinabung in the North Sumatra regency of Karo has erupted once again, spewing a pyroclastic fl...

The island is formed from a cluster of eighteen lava domes, with rhyolite and pyroclastic ash deposits.

It also involved a pyroclastic flow - a dangerous fast - moving hot cloud of gas, ash and volcanic matter.

Most of the recent activity has been on the north flanks, where lava and pyroclastic flows have stripped the mountain of vegetation.

Visually, over the last few days there is no eruption accompanied by bursts of ash and pyroclastic material with great pressure since 30/11/2017, but the seismicity is still high.

Pyroclastic flows and material thrown from the volcano tragically killed 78 people living in the nearby communities of Arenal and Pueblo Nuevo.

For the following 40 years, Arenal Volcano has regularly produced pyroclastic surges sending rivers of lava flowing down its impressive cone - shaped sides.

The largest of them occurred in the late 6th century, and is believed to have generated pyroclastic flows — that of hot gas, ash and rocks blown out of a volcano — reaching at least 50 kilometers from Rabaul.

The CO2 killed many trees and plant life with the overwhelming amounts that came out of the volcano, this includes the pyroclastic cloud witch contains copious amounts of CO2.

Immense flood basalts were accompanied by pyroclastic eruptions and together produced the Siberian Traps, an area of 2 million square kilometers of volcanic rock, which formed suddenly, on the Earth's surface.

With the pyroclastic explosions came enormous amounts of ash, so it is presumed the eruptions may have first led to a drastic cooling.

A pyroclastic deposit has never been observed on the sea floor below 3,000 m, presumably because the volatile content of mid-ocean-ridge basalts is generally too low to produce the gas fractions required for fragmenting a magma at such high hydrostatic pressure.

Dr Kamata also points out that the ash, lava flow, and the entire picture of violence such as pyroclastic flow, and how the mountain body collapsed should be used for the prevention of future disasters, using the method of hazard maps.