Locating an epicenter

Even classes, due 3/1/11
Odd classes, due 3/2/11

Finish the Locating the epicenter class work if you did not finish in class.  The figures mentioned are in your text book.

Problem:  Determine the epicenter location and the time of occurrence of an actual earthquake, using the travel time of P and S waves recorded at three seismic stations.

Materials:  figure handout and map, drafting compass (or string and tack), metric ruler

Procedure:

1.       The seismogram in Figure 19-8 shows the arrival time of the first P-wave at 10h, 50min, 32s GMT.  Estimate the arrival time of the first S-wave to the nearest tenth of a minute.

2.       Subtract this S-wave time from the initial P-wave time. What is the P-S separation on the seismogram, in minutes and tenth of minutes?  Enter this value in the Data table for the Berkeley seismic station.

3.       The P-S separation observed on two other seismogram, also listed on the table.  Use the travel-time curves in Figure 19-9 to determine the distances at which the P- and S- curves are separated by the time intervals listed in the data table under map epicenter distances.

4.       Use the scale to determine the map distance (in cm) for the epicenter distances from each seismic station and record these distances in the table.

5.       Use the compass to draw circles around each station on the map with the radius of each circle equal to the map distance in cm, for that station.’

6.       Mark the point of intersection.  This is the epicenter of the earthquake.

7.       Determine the time of occurrence of the earthquake by reading the P-wave travel time from Figure 19-9 for the epicentral distance for Berkeley.  Subtract this from the initial P- wave arrival time at Berkeley, which was 10h, 50mom.  Express this time in hours, minutes and seconds.

AND
Read 511-515 1) according to the reading how do tsunamis occur?  2) Why is the term tidal wave incorrect for describing tsunamis?  3)  do the using math problem on p 513

ND EQ 1

Even classes due 2/18/11

Read 505-510 and describe how seismic waves have provided evidence of the Earth's interior structure and composition.

PERIOD 1, 3, 4 & 6; none of you pointed out that the Mercalli and Richter scales were not part of the previous hw reading.  And I erred by assigning as DSW describing these scales instead of assigning the description as hw.  I will not grade you down for the DSW, you do need to answer the above hw based on the previous HW read and be sure to read p505-510.


Odd classes due 2/28/11
PERIOD 5; a student noted that the DSW on Describing the Richter and Mercalli scales was not in the previous hw reading selection.  In 5th period your DSW was to describe seismic waves as evidential support for Earth's interior structure and composition.  You are to do the reading of p 505-510 and describe the difference between the Richter and Mercalli scales; you do not need to copy the scales.

More deformation

both classes use the text book to diagram the reverse, normal and strike slip fault into you notebooks, label the diagrams. 

NOTE:  earthquake disaster experts need to know the type of fault that causes their EQ and other types of fault beyond the three listed here.

Due:  even 2/16/11; odd 2/17/11

EMP revisits

Even classes your revisits are due by 2/15/11 office hours, come to my room at 3PM.

Odd classes your revisits are due by 2/17/11 in class or at lunch office hours.

Missing WCPs must be turned in before 2/15 to avoid 0 points and strike on academic honesty policy.  Come to office hours if you need more feedback on poster revisits.  Students must contribute to poster revisits to earn more points.

Plate deformation 2

Even classes due on 2/14/11

read 495-504 and make sure you have diagrams of strains and folds in your notebook.

Deformation of plate read

Odd classes, oops and even now

read p. 84-91

Study for EM test

Even classes test Tuesday & Odd classes test Wednesday.

All notebooks considered approved if the notes are in your own handwriting & no loose papers in notebook.

I have advised making the final draft of the Density of Mineral lab as a homeowrk assignment versus completing it (question #4) during the test, see earlier post.