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Do seismic waves travel in a straight line?

Why do seismic waves travel a curving path through the Earth? If there were no changes with depth, seismic waves would travel a straight path to the other side of the Earth. But wave arrivals to distant seismic stations have taught us that there are layers.

What do seismographs tell us?

A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage.

How do you read a seismograph and epicenter?

The distance between the beginning of the first P wave and the first S wave tells you how many seconds the waves are apart. This number will be used to tell you how far your seismograph is from the epicenter of the earthquake. Measure the distance between the first P wave and the first S wave.

What are the three components of a seismograph?

To overcome this problem, modern seismograph stations have three separate instruments to record horizontal waves – (1) one to record the north-south waves, (2) another to record east-west waves, and (3) a vertical one in which a weight resting on a spring tends to stand still and record vertical ground motions.

What are two events that can cause a tsunami?

Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.

How do you read a seismogram?

The seismogram is “read” like a book, from left to right and top to bottom (this is the direction that time increases). As with a book, the right end of any horizontal line “connects” with the left end of the line below it. Each line represents 15 minutes of data; four lines per hour.

What can you learn from a seismogram?

By studying the seismogram, the seismologist can tell how far away the earthquake was and how strong it was. This record doesn’t tell the seismologist exactly where the epicenter was, just that the earthquake happened so many miles or kilometers away from that seismograph.

What does seismogram mean?

A seismogram is a record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.

What is the hypocenter?

The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus.

What’s a epicenter?

epicenter. The epicenter is the point on the earth’s surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins.

What is the difference between center and epicenter?

In seismology, the epicenter is the place on the surface of the earth above the origin of an earthquake, whereas the hypocenter is the actual starting point within the earth. In seismology, the epicenter refers to the part of the earth’s surface directly above the focus of an earthquake.

What is epicenter in simple words?

The epicenter, epicentre (/ˈɛpɪsɛntər/) or epicentrum in seismology is the point on the Earth’s surface directly above a hypocenter or focus, the point where an earthquake or an underground explosion originates.

How do you use epicenter in a sentence?

Epicenter sentence example This old fishing town is the epicenter of Maui’s long history. The main quake occurred along the San Andreas fault and was felt as far as Los Angeles and Oregon, but the epicenter occurred most closely to the city by the bay. epicenter of the modern dance world.

Why is it important to locate the epicenter of an earthquake?

The main importance in determining the epicentre is so that the fault that ruptured causing the earthquake can be identified. If the fault is previously unknown (such as the 2010 Canterbury earthquake), then it is important because it means that the hazard models for the area need improvement.

What is a sentence for magnitude?

Magnitude sentence example. If the magnitude and increasing complexity of these creations fails to impress you, the sheer quantity should suffice. The magnitude of that what-if scenario was downright scary. She listened, unable to fathom the magnitude of chaos he spoke of.

How do you use intensity in a sentence?

Intensity in a Sentence ?

  1. The stranger stared at her with an intensity that made her uncomfortable and she had to look away.
  2. The hurricane increased in intensity and climbed to almost 150 mph winds.
  3. The intensity of the bitter lemon flavor made her close her eyes, pucker her lips, and reach for a glass of water.

What is the description of intensity?

1 : the quality or state of being intense especially : extreme degree of strength, force, energy, or feeling. 2 : the magnitude of a quantity (such as force or energy) per unit (as of area, charge, mass, or time)