Catalog Description and Data Format

Introduction

This seismological catalog is composed of the earthquake hypocenter determinations selected from "The Seismological Bulletin", issued by the Experimental-Methodical Expedition of the Institute of Physics of the Earth, Russian Academy of Sciences, at Obninsk, Kaluga Region, Russia.
The catalog covers the period from 01.01.1983 up to now and includes earthquakes occurred in the territory of Russia with magnitude M >= 4.5 (for the Far East M >= 5.0) and in other countries of Asia and Europe with M >= 5.5.

Seismological Catalog consists from the event set: 

     Event_1  Event_2  ...  Event_N

There are 3 record types, which all represent one event:

Record_type
(internal code)		 Record_identification
(for manual pages only)		 Relative_name
(for manual pages only)
1 Epicenter line Head
2 Magnitude line Magn
8 Comments Comm

Each record is 80 bytes long.

Epicenter line

Bytes Contents Format Description
1-2 This record type i2 must be = 1
3-4 Next record type i2 2, 8 or 1
5-12 Event date i4,2i2 YYYYMMDD, YYYY - year,
MM - month, DD - day
13-19 Origin time 2i2,f3.1 hhmmsss, hh - hours, mm -
minutes, ss.s - seconds
20-22 Standart deviation f3.2 Rms of defining phase
residuals
23-27 Latitude f5.3 in degrees
28 Latitude symbol a1 N or S
29-34 Longitude f6.3 in degrees
35 Longitude symbol a1 E or W
36-38 Small axis of ellip.error f3.1 in kilometers
39-41 Large axis of ellip.error f3.1 in kilometers
42-45 Large axis azimuth f4.1 in degrees
46-48 Focal depth i3 in kilometers
49-57 Reserved a9 blanks
58-60 Number of P/PKP epicenter
defining observations		 i3 
61-63 Total number of P/PKP
observations		 i3 
64-66 Number of P/PKP focal
depth defining observations		 i3 
67-70 Seismic region number i4 
71-73 Geographical region number i3 
74-77 Event number since the
beginning of the year		 i4 
78 Station data printing flag i1 0 or 1: 0 = yes, 1 = no *)
79-80 Number of magnitude types
defined for this event		 i2 0, 1, 2 or 3

*) Printed bulletin version contains station data for events that have magnitude more than some predefined values(for "Bulletin").

Magnitude line

Bytes Contents Format Description
1-2 This record type i2 must be = 2
3-4 Next record type i2 8 or 1
5-12 Event date i4,2i2 YYYYMMDD, YYYY - year,
MM - month, DD - day
13-14 Number of magnitude types i2 1, 2 or 3
15-16 Magnitude value f2.1 
17-20 Magnitude type a4 "MPSP", "MPLP" or "MS"
21-22 Reserved a2 blanks
23-26 Channel a4 "SP","SPZ","SPN","SPE",
"MP","MPZ","MPN","MPE",
"LP","LPZ","LPN","LPE"
27-29 Number of observations
for this magnitude type		 i3 
30-44 The same as 15-29 bytes
for second magnitude type		  if number of magnitude
types > 1
45-59 The same as 15-29 bytes
for third magnitude type		  if number of magnitude
types = 3
60-80 Reserved a21 blanks

Comments

Bytes Contents Format Description
1-2 This record type i2 must be = 8
3-4 Next record type i2 8 or 1
5-12 Event date i4,2i2 YYYYMMDD, YYYY - year,
MM - month, DD - day
13-70 Comment text a58  
71-80 Reserved a10 blanks

Catalog Example:

 1 21997 221 830 69 9051739N177641E 76 87-149 53 0  0 0 0 57 58 57   1  6 3441 2

 2 11997 221 253MPSP  SP   2040MS    LP    4

 1 21997 221123448910018175N145090E129611 104466 0  0 0 0 12 12 12  18216 3461 1

 2 11997 221 147MPSP  SP    4

 1 21997 2211724116 9248636N152902E 82142-144186 0  0 0 0 37 40 37  19221 3481 1

 2 11997 221 146MPSP  SP   10

 1 21997 2212340271 9444164N149120E 53 74 111 46 0  0 0 0120139122  19221 3490 3

 2 81997 221 365MPSP  SP   1964MPLP  LP    561MS    LP   23

 8 81997 221 MO 8.4E18 n.m (OBN)

 8 81997 221 Fault plane solution: P-waves C60, D6

 8 81997 221 NP1: STK 162 , DP 35 , SLIP  30 .

 8 81997 221 NP2: STK  47 , DP 73 , SLIP 121 .

 8 81997 221 T PL 52 , AZM 352 ; N PL 29 , AZM 217 ;

 8 81997 221 P PL 22 , AZM 114 .

 8 11997 221Felt (II) at Kurilsk.

 1 21997 222 3 2 82157 3638N126850E210689 101 33 0  0 0 0 10 10  0  23263 3501 1

 2 11997 222 146MPSP  SP    2
Last revision December 5, 2005