Most earthquake energy becomes heat, not vibrating

Electronic photographic examination is highlighted by an area of ​​rocks that have declined during an earthquake resulting from the laboratory. The “flowing” central area is part of the melted rock and turned into glass due to extreme friction heating. Credit

Most earthquake energy turns into a heat instead of shaking the earth, and sometimes hot enough to dissolve the rocks in the microscopic. The Massachusetts Institute's Technology Labies reveal this hidden balance and its role in seismic risks.

Measurement of earthquake energy in the laboratory

When the earthquake strikes, the violent shaking that people feel only represents a small part of the total energy emitted. Earthquakes also unleash heat thumbness from heat and cause successive fractures in deep underground rocks. Determining the amount of energy that comes in each of these operations is very difficult in the real world.

To address this, geologists at the Massachusetts Institute of Technology “Laboratory Earthquakes” have studied small versions of natural earthquakes that could be carefully launched in the conditions of the censorship laboratory. For the first time, they managed to calculate the full energy budget for these events, and determine the amount allocated to heat, shaking and rock cracking.

The heat dominates the energy budget

The researchers discovered that only 10 percent of the earthquake laboratory energy produces actual vibration, while less than 1 percent is used to disassemble rocks and create new surfaces. The vast majority, which is about 80 percent average, is converted into heat near the earthquake center. In some cases, the high temperature was so severe that it melted the surrounding material for a short period, and turned it into a liquid before cooling again.

They also showed that this energy balance is not fixed, but it depends on the date of distortion of the region, or the extent of changing its rocks through the previous tectonic movement. This date affects the amount of earthquake energy in heat, movement or cracking.

“The date of deformation-what the rock is mainly remembered-really affects the extent of the destruction of the earthquake,” says Daniel Ortega Aroyo, a student of graduate studies in the Department of Earth Sciences and Sciences in the atmosphere. “This date affects many of the properties of materials in the rock, and to some extent dictate how it will slip.”

Simple planning shows a sample of rocks that are subject to a laboratory earthquake experience, which releases energy in three forms: cracking and dilution (decrease in the size of the grains); Fricular heating and seismic shake. Credit

The team laboratory earthquake is a simplified representation of what is happening during a natural earthquake. On the road, their results can help seismologists to predict the possibility of earthquakes in areas exposed to seismic events. For example, if scientists have an idea of ​​the vibration of an earthquake that has been created in the past, they may be able to estimate the degree that the earthquake's energy also affected the rocks deeply underground by melting or dismantling it. This, in turn, can reveal how weak the area is to future earthquakes.

“We can never reproduce the complexity of the Earth, so we have to isolate the physics of what is happening, in these laboratory earthquakes,” says Matj B, Associate Professor of Geophysics at the Massachusetts Institute of Technology. “We hope to understand these operations and try to extract them with nature.”

I reported PEč (PECK “) and Ortega-Arroyo about its results on August 28 in the Augu Advances magazine. The authors of the Massachusetts Institute of Technology are HoGY O'Ghafari, Camilla Cattania, along with Zheng Gong, Roger Fu at Harvard University, OHL and OHL and Oliver Plümper at Utrecht University in the Netherlands.

Hidden powers below the surface

Earthquakes driven by energy that are stored in rocks for millions of years. Also, the Tktuni grinding is grinding slowly against each other, stressing by dandruff. When the rocks are pushed through their physical power, they can suddenly slip along a narrow area, creating a geological error. While the rocks slip on both sides of the error, they produce seismic waves rippled outward and up.

We are mainly aware of the earthquake energy in the form of earth vibration, which can be measured using earthquake measuring devices and other ground tools. But the other two main forms of the earthquake energy – heat and underground cracking – are not largely accessible with current techniques.

“Unlike the weather, where we can see daily patterns and measure a number of relevant variables, it is very difficult to do this in the depth of the earth,” says Ortega Aroyo. “We do not know what is happening to the rocks themselves, and the temporal shows that earthquakes are repeated within the rift area in the time ranges from the century to mile, which makes any kind of impartial prediction a challenge.”

For an idea of ​​how the earthquake energy is divided, and how this energy budget can affect the seismic risks of the region, he and PEč went to the laboratory. Over the past seven years, the PEč Group has developed at the Massachusetts Institute of Technology Styles and Simulation Simulation Simulation of Events, in the microscope, trying to understand how earthquakes can play in justice.

“We are focusing on what is really happening on a small scale, as we can control many aspects of failure and try to understand it before we can do any scaling of nature,” says Ortega Aroyo.

Create a controlled “microshaks”

For their new study, the team created mini laboratory earthquakes that mimic the seismic slip of rocks along the rift area. They worked with small granite samples, which represent rocks in the seismic layer – the geological area of ​​the continental crust where earthquake usually arises. They wear granite in a soft powder and mix broken granite with a more accurate powder than magnetic molecules, which they used as a kind of inner temperature. (The strength of the magnetic field of the particle will change in response to the volatile volatility.)

The researchers put samples of crushed granite – each with about 10 millimeters and 1 millimeters of thin – between two small presses and the group drew in a gold jacket. Then they applied a strong magnetic field to direct the magnetic molecules of the powder in the same initial direction and to the same field. They justified that any change in the direction of the particles and the strength of the field after that should be a sign of the amount of heat that the region witnessed as a result of any seismic event.

Once the samples are prepared, the team put it one by one in a device created by request that the researchers set to apply the growing pressure steadily, similar to the pressures suffering from the experience of rocks in the earth's earthquake, about 10 to 20 kilometers below the surface. They used dedicated Piezoelectric sensors, which were developed by the participating author O'Ghaffari, which attached to either side of a sample to measure any vibrator because it increased the pressure on the sample.

Severe heat and rapid slide in MicroseConds

Notice that at some pressure, some samples retreated, resulting in a microscopic seismic event similar to an earthquake. By analyzing magnetic particles in the samples after the truth, they got an estimate of the extent of temporarily heating each sample – a method developed in cooperation with the Roger Fu Laboratory at Harvard University. They also estimated the amount of experience of each experienced sample, using measurements from a compressor sensor and digital models. The researchers also examined each sample under a microscope, in various effects, to assess how the size of granite granules change – whether the number of pills that stormed for example and the number of granules, for example.

Of all these measurements, the team enables the power budget to estimate every laboratory earthquake. On average, they found that about 80 percent of the earthquake energy involves the temperature, while 10 percent of the shake is born, and less than 1 percent goes to breaking rocks, or creating new smaller particles.

“In some cases, we saw that, close to the error, the sample moved from room temperature to 1200 degrees Celsius on the issue of microchet, then it was immediately cooled as soon as the movement stopped,” says Ortega Aroo. “In one sample, we saw that the error moves about 100 microns, which means that the sliding speeds are about 10 meters per second. It moves very quickly, although it does not last very long.”

Towards better earthquake models

Researchers suspect that similar operations play in actual earthquakes.

“Our experiences offer an integrated approach that provides one of the most complete views of an earthquake -like bars in the rocks so far,” says Biz. “This will provide evidence of how to improve current earthquake models and mitigate natural risks.”

Reference: “Laboratory Laboratory”: Determining the full energy budget for the failure of the high pressure laboratory “by Daniel Ortega Arrowio, Huji Ugapari, Mats GB, Cheng Gong, Roger R. Support, Partially, by the National Science Foundation.

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