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jAmaSeis references time in Coordinated Universal Time (UTC), the international time standard. It is the current term for what was commonly referred to as Greenwich Meridian Time (GMT). Zero (0) hours UTC is midnight in Greenwich, England, which lies on the zero longitudinal meridian. Universal time is based on a 24hour clock, therefore, afternoon hours such as 4 pm UTC are expressed as 16:00 UTC (sixteen hours, zero minutes).

Conversions of UTC: Pacific Standard (Portland, OR) + 8 hours Mountain Standard (Santa Fe, NM) + 7 hours Eastern Standard (Washington DC) + 5 hours

CAUTION: Keep your computer set to local time; jAmaSeis makes the necessary adjustment based on the time zone setting of your computer.

  • Using default settings each horizontal line represents an hour. The current time (UTC) is found in the bottom left corner of the screen. The trace should be recording along the bottom hour line.
  • The sampling rate is the number of data values per second that are sent from the seismometer to the computer. It should be a number between 6.1 and 6.2 samples per second for the AS-1.


The window that appears when the program is launched is called the Stream View screen. The recording emulates what appears on a drum recorder (shown below).

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Station Information

Hours (Y-axis)

Time at cursor position (UTC)

Minutes (X- axis)

Current Time