Plain:

left-click = time scroll left

right-click = time scroll right

middle-drag = grabs display to move it left and right



With Shift Key held down

left-click = time zoom in

right-click = time zome out

middle-drag = equivalent to plain



With Control Key held down

left-click = channel zoom in

right-click = channel zoom out

middle-drag = grabs display and moves it up and down



Click over left scroll bar

Left and right buttons have no effect, but click right brings up a menu with four items whose effects are:



Assignment:



Take the event you all downloaded from IRIS a few weeks ago. Complete the following:

1. Make a record section display of your data and print it. Do this for both B and L channels if you have them.

2. Pick one or more stations and go through the following sequence of steps:

a. Treat this seismogram like one of the analog records we have been looking at and mark a series of protoarrivals on the record that you think look like distinct arrivals. Use the "U" default flag for ph

b. Run the oe and ae commands to get an association (you did this before to have made the record section)

c. Use the sp command to help you identify which phases seem to correlate with one's you picked. Use the ph labelling command to add a new pick (on top of your previous one if necessary) that marks associated phases based on the predicted arrival time shown by sp

3. We will look at all your examples in record reading next week on the computer. It turns out that dbpick doesn't print arrival flags, or at least I've not learned of any undocumented feature that does allow this.