Sentences with word «pyroclastic»

The word "pyroclastic" describes something that is related to volcanic material that is hot, fast-moving, and can be harmful. Full definition
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.
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.
The combined effects of pyroclastic flows, volcanic ashes and tsunamis had disastrous results in the region.
The Arenal Volcano is active since 1968, it constantly ejects gases, water, fumaroles and explosions with pyroclastic material emissions, and sometimes the eruptions are accompanied with powerful thunders.
For the following 40 years, Arenal Volcano has regularly produced pyroclastic surges sending rivers of lava flowing down its impressive cone - shaped sides.
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.
These observations raise important questions about the accumulation and discharge of magmatic volatiles at ultraslow spreading rates on the Gakkel ridge5 and demonstrate that large - scale pyroclastic activity is possible along even the deepest portions of the global mid-ocean ridge volcanic system.
After an uneventful landfall on Epi, we sailed on to Ambrym, to spend a night ogling the lava jets in the crater of the Mount Benbow caldera, which rather disconcertingly went into pyroclastic eruption the next, day, covering the boat in ash.
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.
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.
The lava erupted explosively in shallow waters producing large volumes of a glassy pyroclastic rock called hyaloclastite.
Those glimpses of the surface revealed deposits of pyroclastic ash — the telltale signs of volcanic explosions — peppering the planet's surface.
Worst possible scenario involves pyroclastic flows — currents of hot gas and rock moving at 70 miles per hour
This Miocene unit is composed of multiple shallow «maar» volcanic craters with alternating layers of explosively formed pyroclastic rocks, and fine - grained dark basaltic rock, formed from cooling lava flows.
Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite.
They examined 130 outcrops on the flanks of the volcano, exposing sequences of pumice — ash hardened into rock — and other pyroclastic material.
The false color image of the same spot, bottom, marks pyroclastic material as brownish red.
«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.
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 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.
Although this process has no exact analogue on Earth, it can be related to terrestrial pyroclastic flows, which are gas - particle mixtures generated during volcanic eruptions.
What's uncanny about his words, 1,935 years on, is how close he came to capturing the experience of watching the new Paul W. S. Anderson film about that very disaster: in our cosseted 21st - century lives, we may never know the twisting agony of roasting to death in a surge of pyroclastic debris, but here is the next worst thing.
That, he said, pointing to a model drawn on his whiteboard, would create a column that would then rain down dangerous pyroclastic flows.
Players race a car down a mountain to escape a roaring pyroclastic flow, dodge toppling buildings during a devastating earthquake and swim for their lives in a raging flood.
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.
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.
Here we present images revealing that the axial valley at 4,000 m water depth is blanketed with unconsolidated pyroclastic deposits, including bubble wall fragments (limu o Pele) 2, covering a large (> 10 km2) area.
For 42 years, Arenal Volcano was Costa Rica's most active volcano with flowing lava and pyroclastic surges that blasted huge rocks and cauliflower - shaped ash clouds into the air.
Pumice is formed as pyroclastic material is ejected into the air as a froth containing masses of gas bubbles or vessicles, the lava solidifies quickly and the vessicles are contained in the rock.
The island is formed from a cluster of eighteen lava domes, with rhyolite and pyroclastic ash deposits.
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.
«The difference between other volcanoes and Mount Agung is that there are no scientific records about previous eruptions here, only people's experiences,» Syahbana said.In 1963, pyroclastic flows of lava and rocks poured out of the volcano, killing more than 1,000 people and razing dozens of villages.
They were tourists, there for the show as each victim is swept away under their detached eyes, snapping a few selfies as the comet collides, as the pyroclastic surge overwhelms the village, as the killer pulls the trigger.
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.
Nearly all of them died within the first twenty - four hours, mostly from ash falls and pyroclastic flows — rapidly moving streams of partially liquefied rock and superheated gas at temperatures up to 1,000 degrees, hot enough to melt glass.
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.
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.
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.
The pyroclastic flows themselves, which is what actually killed most of the victims, were well done, Lopes says.
The first explosion did indeed occur around 1 P.M. local time but it wasn't until the next morning that the pyroclastic flows first reached the city.
The mountain erupted on 3 June, sending a pyroclastic flow 4.5 kilometers from the crater.
Using that method, Goudge and his colleagues showed that some pyroclastic deposits are found in relatively young (geologically speaking) craters dated to between 3.5 and 1 billion years old.
In 1963, an eruption of Agung killed more than 1,000 people and razed several villages by hurling out pyroclastic material, hot ash, lava and lahar.

Phrases with «pyroclastic»

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