The first seismometer was made in
China
during the 2nd century. It was invented by Zhang Heng, a Chinese mathematician and astronomer.
What year does the first seismograph invented?
The first true seismograph, according to Italian seismologists, was created in
1875
by Italian physicist Filippo Cecchi. The Cecchi seismograph also used pendulums, but it was the first to record the relative motion of the pendulums with respect to Earth’s ground motions as a function of time.
Where are seismometers located?
The network will consist of approximately 150 seismograph stations distributed across the contiguous 48 states and
across Alaska, Hawaii, Puerto Rico and the Virgin Islands
. Data transmission will be via two-way satellite telemetry from the network sites to a central recording facility at the NEIC in Golden, Colorado.
What is the origin of the seismograph?
Seismograph comes from
the Greek words seismos, “earthquake,” and graph
, “writing.”
What is the atomic bomb equivalent to a 8.0 earthquake?
| Magnitude Energy in joules (J) TNT equiv. | 5.0 2.0 x 10 12 500 tons of TNT | 6.0 6.3 x 10 13 15 kilotons of TNT | 7.0 2.0 x 10 15 500 kilotons of TNT | 8.0 6.3 x 10 16 15 million tons of TNT |
|---|
What is the oldest earthquake?
The earliest recorded evidence of an earthquake has been traced back to
1831 BC in the Shandong province of China
, but there is a fairly complete record starting in 780 BC during the Zhou Dynasty in China.
What does the P stand for in P wave?
Compressional waves are also called P-Waves, (P stands for
“primary”
) because they are always the first to arrive.
Where do most earthquakes occur?
The world’s greatest earthquake belt, the circum-Pacific seismic belt, is found
along the rim of the Pacific Ocean
, where about 81 percent of our planet’s largest earthquakes occur. It has earned the nickname “Ring of Fire”.
Are seismographs still used today?
Seismographs are instruments used to measure seismic waves produced by earthquakes. Scientists use these measurements to learn more about earthquakes. While the first seismograph was made in ancient China,
today’s modern instruments
are based on a simple design first created in the 1700s.
Who coined the term earthquake?
He coined the term from the Greek seismos, or earthquake. 4.
Mallet
wasn’t the first to study tremors, though. Back in the fourth century B.C., for example, Aristotle theorized that surface shakes were caused by winds whooshing through underground spaces.
Who invented the Richter scale?
The Richter magnitude scale was developed in 1935 by
Charles F. Richter
of the California Institute of Technology as a mathematical device to compare the size of earthquakes. The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs.
What do we call someone who studies earthquakes?
Seismologists
study earthquakes by looking at the damage that was caused and by using seismometers. A seismometer is an instrument that records the shaking of the Earth’s surface caused by seismic waves. The term seismograph usually refers to the combined seismometer and recording device.
Is a 10.0 earthquake possible?
No, earthquakes of magnitude 10 or larger cannot happen
. The magnitude of an earthquake is related to the length of the fault on which it occurs. … The largest earthquake ever recorded was a magnitude 9.5 on May 22, 1960 in Chile on a fault that is almost 1,000 miles long…a “megaquake” in its own right.
What is the atomic bomb equivalent to a 7.0 earthquake USGS?
A magnitude 4.0 earthquake is only equivalent to about 6 tons of TNT explosives, but because the Richter scale is a base-10 logarithmic scale, the amount of energy released increases quickly: A magnitude 5.0 earthquake is about 200 tons of TNT, magnitude 6.0 is 6,270 tons, 7.0 is
199,000 tons
, 8.0 is 6,270,000 tons, …
How bad is a 6 earthquake?
Generally, earthquakes of magnitude 6 and above are the
ones for concern
. When nearby, they can cause shaking intensities that can begin to break chimneys and cause considerable damage to the most seismically vulnerable structures, such as non-retrofitted brick buildings.
Will California fall into the ocean?
No, California is not going to fall into the ocean
. California is firmly planted on the top of the earth’s crust in a location where it spans two tectonic plates. … There is nowhere for California to fall, however, Los Angeles and San Francisco will one day be adjacent to one another!
