INFORMATION (IEFM DTSVNWG on Screen Search): Dots are used in place of blanks to aid in the distinction between the columns. Read the sub-headers vertically.
Maximum intensity on the Modified Mercalli Intensity Scale of 1931 (Wood and Neumann, 1931) or any similar 12-point intensity scale. It may also be an MMI value approximated from other intensity scales such as Ross-Forel or Japan Meteorological Agency. Possible intensity values are 1 - 9; X = 10; E = 11; T = 12.
The most severe effect is listed (C = Casualities; D = Damage; F = Felt; H = Heard). Note that casualties includes human deaths or injuries. Domestic animal casualties are considered to be damage.
(Expanded Format only)
Indicates the publication where an isoseismal map for this event has been published.
- U = United States Earthquakes.
- E = Earthquake Notes. (Now Seismological Research Letters)
- P = Preliminary Determination of Epicenters.
- W = Wellington (New Zealand
- Seismology Reports, Wellington, N.Z.).
- N = Nature Magazine.
- S = Bulletin of the Seismological Society of America.
Coded as an "F" to indicate the availability of a fault plane solution in the publication, "Preliminary Determination of Epicenters, Monthly Listing".
Coded as an "G" to indicate the availability of a moment tensor solution in the publication "Preliminary Determination of Epicenters, Monthly Listing" (Sipkin, 1982; Dziewonski, 1980; and Hanks and others, 1979).
A "D" in this column indicates that a pP depth is given, but the pP depth is not the adopted depth in the hypocenter solution.
An "X" in this column identifies the event as a "IDE" earthquake.
A "P" in this column designates a preferred solution. Earthquake hypocenters which are located within a seismic network, such as Pasadena or Berkeley, or seismic catalogs which have undergone critical review during their compilation will be designated as a preferred solution.
Currently not used.
- F = Faulting.
- U = Uplift.
- S = Subsidence.
- 3 = Uplift and Subsidence.
- 4 = Uplift and Faulting.
- 5 = Faulting and Subsidence.
- 6 = Faulting with Uplift and Subsidence.
- 7 = Uplift or Subsidence.
- 8 = Faulting and Uplift or Subsidence.
- T = Tsunami generated.
- Q = Questionable Tsunami.
S = Seiche.
- Q = Questionable Seiche.
- V = Earthquake associated with volcanism.
- E = Explosion.
- I = Collapse.
- C = Coal bump or Rockburst in a coal mine.
- R = Rockburst.
- M = Meteoritic.
- N = Either known to be or likely to be of non-tectonic origin.
- ? = Classified as an earthquake, but a non-tectonic origin cannot be ruled out.
- V = Reservoir induced earthquake.
- T = T-wave.
- A = Acoustic wave.
- G = Gravity wave.
- B = Both A and G.
- M = T-wave plus and A or G.
- L = Liquefaction.
- G = Geyser.
- S = Landslides and/or Avalanches.
- B = Sandblows.
- C = Ground cracks not known to be an expression of faulting.
- V = Lights or other visual phenomena seen.
- O = Olfactory (Unusual odors noted).
- M = More than one of these phenomena observed.