... waves travel horizontally. The time interval between the P- and
S-wave arrivals is measured on a seismogram. A simple rule of
thumb for earthquakes 50-500 km from seismometers: distance
(in km) is about eight times the P & S wave arrival time difference
(in sec). The earthquake can be in any directi ...
Name Date Pd _____ VIDEO: EARTHQUAKES (Bill Nye) 1. ha
... 2. The earth’s surface is made of ________________________ plates that are
floating on molten rock.
3. The cracks are called __________________.
4. Scientists measure the movement of the earth’s crust with a
5. The record of the earth’s movement made with a seismometer i ...
Gr. 8 NOTES: EARTHQUAKES Name: Pages 325 - 327
... 1. Give 3 expressions used to describe the phenomenon by which the Earth’s crust moves. .
2. What is a seismic wave, how are they formed & what do they cause?
... vibrations or oscillations, rapid and more or less
powerful, of the earth's crust, caused by the
unexpected movement of the rock mass in subsoil.
This displacement is generated by tectonics force that
cause the release of energy in an internal point of the
Earth said hypocenter; starting from the fr ...
Fault, in geology, is a fracture
in the Earth's crust along
which a section of the crust
has been displaced relative to
another section, in response
to forces of tension or
compression as a result of
tectonic movement. This
movement may be in a
vertical or horizontal
direction, or a combinat ...
Felix Waldhauser, Lamont-Doherty Earth Observatory Title
... plate tectonic processes. The location of earthquakes within the Earth’s crust and
mantle are the fundamental parameters used in a wide range of research areas,
including earthquake physics, the structure and dynamics of the Earth’s interior, and
seismic hazards. Yet, the accuracy with which we know ...
QR-6 Earthquakes and the Earth`s Interior Answer each of the
... 9. Briefly describe the triangulation method used to determine the epicenter of an earthquake.
10. Describe the differences between the Modified Mercalli Intensity Scale, Richter Scale, and the
moment magnitude scale.
11. How much more energy does an earthquake measuring 7.0 on the Richter Scale rel ...
Seismographs - Ring of Fire Science
... station but not the direction of the epicenter. To determine the exact location of the epicenter of
an earthquake a scientist must first determine the time lapse between the arrival of the P waves
and S waves at three stations. Scientists determining the distance they were from the focus of an
Seismometers are instruments that measure motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources.The word derives from the Greek σεισμός, seismós, a shaking or quake, from the verb σείω, seíō, to shake; and μέτρον, métron, measure and was coined by David Milne-Home in 1841, to describe an instrument designed by Scottish physicist James David Forbes.Seismograph is another Greek term from seismós and γράφω, gráphō, to draw. It is often used to mean seismometer, though it is more applicable to the older instruments in which the measuring and recording of ground motion were combined than to modern systems, in which these functions are separated.Both types provide a continuous record of ground motion; this distinguishes them from seismoscopes, which merely indicate that motion has occurred, perhaps with some simple measure of how large it was.The concerning technical discipline is called seismometry, a branch of seismology.