JMA seismic intensity and acceleration file (96 bytes) Data for each earthquake event consist of the following: EHypocenter record Each event has more than one record. The top record is adopted as the best result. ESeismic intensity and acceleration data record (one or more after 1961; sometimes none before) Col. Item Type Description 1 Record type A1 Codes: identifier A: Hypocenter record B: Hypocenter record (for two or more spatio-temporally close earthquakes whose seismic intensity data cannot be separated) D: Hypocenter record (for two or more temporally close earthquakes whose seismic intensity data cannot be separated) 2 - 5 Year I4 Year of origin time (Japan Standard Time = UTC + 9 h; the same applies below.) 6 - 7 Month I2 Month of origin time 8 - 9 Day I2 Day of origin time 10 - 11 Hour I2 Hour of origin time 12 - 13 Minute I2 Minute of origin time 14 - 17 Second F4.2 Second of origin time 18 - 21 Standard error F4.2 Standard error for origin time (seconds) (seconds) 22 - 24 Latitude I3 Latitude of hypocenter (degrees) (degrees) 25 - 28 Latitude F4.2 Latitude of hypocenter (minutes) (minutes) 29 - 32 Standard error F4.2 Standard error for latitude (minutes) (minutes) 33 - 36 Longitude I4 Longitude of hypocenter (degrees) (degrees) 37 - 40 Longitude F4.2 Longitude of hypocenter (minutes) (minutes) 41 - 44 Standard error F4.2 Standard error for longitude (minutes) (minutes) 45 - 49 Depth F5.2 Depth in kilometers (depth-free method) (kilometers) The depth of focus is treated as an unknown variable. I3,2X Depth in kilometers (depth-slice method) The optimal solution is sought with different source depths. Width of change: 10 km (1926 - 1960, 1967 - 1982) Width of change: 20 km (1961 - 1966) Width of change: 1 km (1983 -) Hypocenters from before 1982 are being re-examined and relocated based on calculation using the depth-free method or the 1 km-width depth-slice method. 50 - 52 Standard error F3.2 Standard error for depth (kilometers) (kilometers) 53 - 54 Magnitude 1 F2.1 See magnitude type 1 When the magnitude is less than 0, this column is denoted as follows: -0.1:-1;-0.9:-9;-1.0:A0;-1.9:A9;-2.0:B0;-3.0:C0 55 Magnitude A1 JMA magnitudes type 1 J: MJ - Local Meteorological Office magnitude D: MD - Displacement magnitude d: Md - As per MD, but for two stations V: MV - Velocity magnitude v: Mv - As per MV, but for two or three stations Moment magnitudes W: MW - Moment magnitude based on JMA's centroid moment tensor solution Other organizations' magnitudes B: mb - USGS body wave magnitude S: MS - USGS surface wave magnitude 56 - 57 Magnitude 2 F2.1 See magnitude 1 58 Magnitude A1 See magnitude type 1 type 2 59 Travel time A1 Travel time table type table 1: Reported by Ichikawa and Mochizuki (1971), Hamada (1984) (hereafter 83A) and others 2: Reported by Ichikawa (1978) (hereafter LL) (for the area far east of the Sanriku district) 3: Tables reported by Ichikawa and Mochizuki (1971) and LL, or 83A and LL (for the area east of Hokkaido) 4: Tables reported by Ichikawa and Mochizuki (1971) and LL, or 83A and LL (for southern parts of the Kurile Islandsj 5: Table reported by Ueno et al. (2002) (hereafter JMA2001) 6: JMA2001 and LL (with the mesh interval of LL matched to that of JMA2001) (for southern parts of the Kurile Islands) 7: JMA2001A for inland stations, JMA2020A for those within landward slopes, JMA2020B for those in outer-rise regions of the Japan Trench, and JMA2020C for those within the Nankai Trough area Blank: Determined by other agencies The tables are used when a hypocenter is determined in these areas: 2: Far east of Sanriku 3: East of Hokkaido 4 or 6: Southern parts of the Kurile Islands 7: Tables corresponding to individual station locations used in hypocenter calculation 60 Hypocenter A1 Hypocenter location precision location 1: Depth-free method precision 2: Depth-slice method 3: Fixed depth 4: Based on depth phase 5: Based on S-P time 7: Poor solution 8: Undetermined or not accepted 61 Subsidiary A1 Subsidiary information on event information 1: Natural earthquake 2: Insufficient number of JMA stations 3: Artificial event 4: Noise 5: Low-frequency earthquake 62 Maximum A1 1: One intensity 2: Two 3: Three 4: Four 5: Five (until September 1996) 6: Six (until September 1996) 7: Seven A: Five lower B: Five upper C: Six lower D: Six upper R: Remarkable earthquake (shock felt over 300 km away) (until 1977) M: Moderate earthquake (shock felt over 200 km away but not over 300 km away) (until 1977) S: Small earthquake (shock felt over 100 km away but not over 200 km away) (until 1977) L: Local earthquake (shock felt less than 100 km away) (until 1977) F: Felt earthquake (until 1984) X: Shock felt by some people but not by JMA observers (until September 1996) 63 Damage class A1 Damage class (after Utsu) 1: Slight damage (cracks on walls and ground) 2: Light damaged (broken houses, roads, etc.) 3: 2 - 19 fatalities or 2 - 999 houses destroyed 4: 20 - 199 fatalities or 1,000 - 9,999 houses destroyed 5: 200 - 1,999 fatalities or 10,000 - 99,999 houses destroyed 6: 2,000 - 19,999 fatalities or 100,000 - 999,999 houses destroyed 7: 20,000+ fatalities or 1,000,000+ houses destroyed X: Injury or damage of unclear scale (until 1988) Y: Injury and damage included in the grade for the preceding or following event (until 1988) 64 Tsunami class A1 1929-1988 Tsunami class (after Utsu) 1: Tsunami recorded by tidal gage but no damage caused T: Tsunami generated 1989 - Tsunami class (after Imamura and Iida, 1958) Height/damage 1: 50 cm/none 2: 1 m/very slight damage 3: 2 m/slight damage to coastal areas and vessels 4: 4 - 6 m/human injury 5: 10 - 20 m/damage along more than 400 km of coastline 6: 30 m+/damage along more than 500 km of coastline 65 District number I1 Number of epicenter location district 66 - 68 Region number I3 Number of epicenter location region 69 - 90 Region name A22 Name of epicenter location region 91 - 95 Number of I5 Number of shocks felt stations 96 Identifiers A1 K: JMA hypocenter identified with high precision S: JMA hypocenter identified with low precision N: Hypocenter unknown (first observation point used) U: USGS hypocenter I: ISC hypocenter R: Preliminary hypocenter (included only in district observatory databases) H,D,M: Exact observation time unknown JMA seismic intensity and acceleration data record (96 bytes) Col. Type Item Description 01 - 07 I7 Seismic intensity Seismic intensity station number station number Numbers are provided in the code_p.dat file. 08 A1 Blank Blank 09 - 10 I2 Day Day of observation time (Japan Standard Time = UT + 9h; the same applies below.) 11 - 12 I2 Hour Hour of observation time 13 - 14 I2 Minute Minute of observation time 15 - 17 F3.2 Second Second of observation time 18 A1 Blank Blank 19 A1 Seismic intensity Seismic intensity on the JMA scale (1 - 7 A, B, C, D) 9: Felt but intensity unknown 20 A1 Blank Blank 21 - 22 I2 Instrumental seismic Seismic intensity as observed using seismic intensity meters intensity (rounded off to one decimal place) '//' indicates no observation; the same applies below. 23 A1 Blank Blank 24 - 25 I2 Minute Minute of maximum acceleration observation time 26 - 28 F3.1 Second Second of maximum acceleration observation time 29 A1 Blank Blank 30 - 34 I5 Maximum acceleration in composition of three components (unit: 0.1 cm/sec^2) rounded off to one decimal place 35 A1 Blank Blank 36 A1 Identifier N 37 - 41 I5 Maximum acceleration in N-S component (unit: 0.1 cm/sec^2) rounded off to one decimal place 42 A1 Blank Blank 43 A1 Identifier E 44 - 48 I5 Maximum acceleration in E-W component (unit: 0.1 cm/sec^2) rounded off to one decimal place 49 A1 Blank Blank 50 A1 Identifier Z 51 - 55 I5 Maximum acceleration in U-D component (unit: 0.1 cm/sec^2) rounded off to one decimal place 56 A1 Blank Blank Note: Columns 57 to 60 are blank for the period before 1 Oct. 2000. 57 A1 Identifier F (frequency) or P (period) 58 - 60 I3 Period of maximum 0.1 Hz or 0.1 sec acceleration Frequencies are applied for periods shorter than 0.1 seconds. (N-S component) 61 A1 Identifier F (frequency) or P (period) 62 - 64 I3 Predominant period 0.1 Hz or 0.1 sec (N-S component) Frequencies are applied for periods shorter than 0.1 seconds. 65 A1 Identifier F (frequency) or P (period) 66 - 68 I3 Period of maximum 0.1 Hz or 0.1 sec acceleration Frequencies are applied for periods shorter than 0.1 seconds. (E-W component) 69 A1 Identifier F (frequency) or P (period) 70 - 72 I3 Predominant period 0.1 Hz or 0.1 sec (E-W component) Frequencies are applied for periods shorter than 0.1 seconds. 73 A1 Identifier F (frequency) or P (period) 74 - 76 I3 Period of maximum 0.1 Hz or 0.1 sec acceleration Frequencies are applied for periods shorter than 0.1 seconds. (U-D component) 77 A1 Identifier F (frequency) or P (period) 78 - 80 I3 Predominant period 0.1 Hz or 0.1 sec (U-D component) Frequencies are applied for periods shorter than 0.1 seconds. 81 - 96 A16 Blank Blank Seismic intensity station list file(code_p.dat) The data file is in TSV(Tab Separated Values) format. Each record includes six items. item Type Item Name Description 01 I7 Seismic intensity The first five figures denote the municipality code. station number 02 - Seismic intensity Station name used in JMA's earthquake information station name (JIS code) 03 2I2 Latitude Latitude north in degrees and minutes (Japanese Geodetic Datum 2000) 04 I3,I2 Longitude Longitude eastern in degrees and minutes (Japanese Geodetic Datum 2000) 05 I4,4I2 Observation start time I4:Year(Japan Standard Time = UT + 9h; the same applies below.) I2:Month I2:Day I2:Hour I2:Minute If the time is unknown, [99] or [9999] is indicated. 06 I4,4I2 Observation end time I4:Year I2:Month I2:Day I2:Hour I2:Minute if the time is unknown, [99] or [9999] is indicated. If the station remains operational, this is blank.