. Ascurately plot the following locations on your California map: Station Longit

Question

. Ascurately plot the following locations on your California map: Station Longitude 23 4" W 120 17" w 59" N 41° 53 N CA KCC (Kaiser Creek, CA) 2. Locate and mark the P-waves and S-waves on the attached seismogram. 3. Accurately estimate the arrival times of the P- and S-waves. and record in the table below 4. Subtract the arrival times of the P-wave and S-wave to find the Lag Time 5. Use the travel-time graph to determine the distance to the epicenter for each seismogram. This is done by measuring out on a picce of paper the Lag Time, then finding that distance that corresponds to that difference graph). 6. Using the map scale, convert distance measurements from kilometers (km) to centimeters (cm). 7. Using a ruler open your circle compass to the appropriate compass distance and draw circles S. If you were very accurate, your cireles should intersect at one point, that being the Epicenter of the quake (if your around each Station. eireles do not intersect, consult your instructor) 9. Accurately determine the Latitude and Longitude of your Epicenter and record on the table below Compass S-Wave Arrival S-P Lag Time Distance to EpicenterDistance Seismogram P-Wave Arrival Time Time (hr:minssec) (sec) (km) (em) (hr:min:sec) Station HOPS KCC MOD LOCATION OF EPICENTER (Don't forget direction N.S.E,W) Latitude: Longitude: HOPS eMago MAGNITUDE OF EARTHQUAKE: Determining the Magnitude 10. For each location, use the Lag Time and the amplitude of the largest S wave (in mm from the center line) to determine the approximate Magnitude of the earthquake. by connecting the dots - record in the table above. 40 1. What is the magnitude of an earthquake with a time difference of 2 seconds and a maximum S-wave amplitude of 10 mm? What S-wave amplitude would an earthquake have if it were 100 km away with Magnitude of 4.0? o.2 AMPLITU DISTANCE

Explanation / Answer

11.Time difference (T)=2 seconds

S-wave amplitude is 10mm

Now to find the magnitude of the earthquake we can use a simple formula-

mb = log10(A/T)

where mb is the standard magnitude,A is the amplitude of ground motion ; T is the corresponding period (in seconds);

now putting the values in the equation we can get the magnitude,

mb =log10(10/2)

or,mb=0.699   

so,by this formula we can easily get the magnitude.

12.The magnitude of the earthquake is=4.0

with a distance or S-P Time=100 km

Question no.10 is not answered due to lack of data.

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