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How far from an earthquake epicenter is an observer who measured a difference of eight minutes 40 seconds and arrival times of p waves and s waves?
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How does the frequency measured in front of the source appear to the observer compared to the frequency measured from behind?
The frequencies are the same, unless the source is moving relative to the observer.
In Pennsylvania what could be the approximate lacation of an observer if he measured the altitude of Polaris to be 40 degrees?
Pittsburgh is about 40° north.
The Doppler technique only provides a measure of the minimum mass of a planet because?
only the motion of star toward the observer is measured, not the full motion
What is the difference between the Mercalli scale the Richter scale and the magnitude scale?
In seismology (the study of seismic waves or vibrations in the ground / earthquakes) the Richter scale is a magnitude scale. Magnitude scales show the amount of energy released by an earthquake. In the case of the Richter magnitude this is based on the amplitude of the seismic waves measured on a seismometer and the distance of the seismometer station from the epicentre of the earthquake. The magnitude value should be the same for a given earthquake no matter where it is recorded. The Mercalli scale is an intensity scale. This gives information on the perceived ground shaking in a specific location. The value is derived from witness reports on the perceived violence of the shaking, from the damage done to buildings and other infrastructure and also based on measurements from accelerometers and other seismic recording instruments in order to make the Mercalli intensity value a less subjective parameter. The intensity and damage to infrastructure can be influenced strongly by a number of variables including local ground conditions and the use (or otherwise) of earthquake resistant design. Please see the related questions for more information.
What is earths apparent motion?
I guess that would be an earthquake. But what do I know. I think it is though.
How far is an observer from an earthquake epicenter is he or she observed a P wave 8 minutes after the earthquake?
14,4oo km away. i think. check calculations to be sure.
Approximately how far is an observer from and earthquake epicenter if he or she observed a p wave 8 minutes after the earthquake?
14,4oo km away. i think. check calculations to be sure.
What are some possible errors when using a Modified Mercalli scale?
the assigned nember can vary from place to place within the disturbed region depending on the location of the observer with respect to the earthquake epicenter. In addition some witnesses of the earthquake might exaggerate how bad thing were during the earthquake and some witnesses might not agree on what happened during the earthquake.
How does the frequency measured in front of the source appear to the observer compared to the frequency measured from behind?
The frequencies are the same, unless the source is moving relative to the observer.
What is path difference?
The path difference is the difference in the physical distance between the two sources to the observer, i.e., the difference in distance travelled from the source to the observer.
What is an apparent brightness?
An apparent brightness is the brightness of a star as measured by an observer.
What is The altitude if Polaris measured by an observer atcthe tropic of cancer?
23.5
Why do you need data from three seismographs to find the epicenter of an earthquake?
Data from one seismometer can give you the distance to an earthquakes epicentre. When data from two stations is available, by plotting the calculated distances as a circle of known radius around the stations, these two circles will intersect in two places. Add in a third station and all three circles will intersect in the same place which is the epicentre.
In Pennsylvania what could be the approximate lacation of an observer if he measured the altitude of Polaris to be 40 degrees?
Pittsburgh is about 40° north.
What could be the approximate location of an observer if he measured the altitude of Polaris to be 41 degrees above the horizon?
New York City.
A parallax is used to travel a star's what?
In astronomy, the difference in direction of a celestial object as seen by an observer from two widely separated points. The measurement of parallax is used directly to find the distance of the body from Earth (geocentric parallax) and from the Sun (heliocentric parallax). The two positions of the observer and the position of the object form a triangle; if the base line between the two observing points is known and the direction of the object as seen from each has been measured, the apex angle (the parallax) and the distance of the object from the observer can be ... (100 of 3053 words)
The Doppler technique only provides a measure of the minimum mass of a planet because?
only the motion of star toward the observer is measured, not the full motion
