Adirondacks, Near Saranac Lake, NY
| Region: 26 km S of Malone, NY; 36 km NW of Saranac Lake, NY
| Date: 04/08/2003
| Time: 15:06:14.4 (UTC)
| Magnitude: ML = 3.2, Mc = 3.4
| Latitude: 44.615 N
| Longitude: 74.340 W
| Depth: 10 km, fixed
Seismic Record Section, broadband vertical-component
This is filtered, vertical-component seismograms (0.6 - 10 Hz) plotted in epicentral distance
versus time from the earthquake on April 8, 2003 near Saranac Lake, NY.
This type of plot is called "seismic record section" and it is useful to look at the
seismic waves propagating from the source to stations across wide area.
The first arrival P waves, either Pg (dotted line) or Pn (solid line) arrival times are
marked across distance up to about 500 km from the source.
The slow but more strong S waves, either Sg or Sn, arrivals are marked. Actually, the strongest amplitude
waves are called Lg waves and are consist of many Sg type arrivals.
Seismic records are from stations in Canada (MNT; Montreal; OTT, Ottawa; GAC, Glen Almond; KGNO, Kingston,
Ontario; SADO, Sadowa, ONT; courtesy Geological Survey of Canada),
US National Network Stations (LBNH, Lisbon, NH; BINY, Binghamton, NY),
IRIS/USGS Global Seismographic Network (HRV, Harvard, MA),
and LCSN (ACCN, Adirondack community college, NY; PAL, Palisades, NY).
Stations of the USNSN and LCSN are backbone of the Advanced National Seismic
System (ANSS) to monitor earthquakes and evaluate their hazards,
and to mitigate their effects on our bridges, buildings, and homes.
LCSN Earthquake Alert message
Arrival time picks
Magnitude, Richter scale
Compiled by Won-Young Kim, Lamont-Doherty Earth Observatory of Columbia University