Seismology Instruction with the AS 1

Using the Travel Time Curve

   After picking arrivals in the Extract Event Screen click 

 on 

the 

Travel Time Curve Icon

   If the depth is known for the event, enter it in the Depth

            Dialog box, or leave the default 33 km.  The depth is 

used to determine the correct travel time curve to use.

   Using the Mouse, drag the trace up or down along the vertical axis to align the 

Arrival Picks with the corresponding Phase Arrival Lines.

   Once the record is aligned with the travel time curve, the distance to the event is reported 

on the left under the trace.  

   The distance is reported in degrees.  To convert from degrees to kilometers:  

1 degree = 111 kilometers

Phase Arrivals

Distance

AmaSeis Version 1.0 Level 2005.05.19

4.8