Time runs faster than real life. A real quake takes about 10 minutes to reach stations 4,000 km away.
Tap a strip to drop the next marker, then drag it. Arrow keys nudge the last marker by 1 second.
Origin time is when the quake started. It equals the P arrival time minus the P travel time.
Drag a white handle to change a circle. Drag the map to move it, and pinch or scroll to zoom.
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