Seismic array observation in Furukawa district is the most dense array network for strong ground-motion observations with a modern remote monitoring system, organized by Kyoto University, Tokyo Institute of Technology, Osaki city office, and aLab Co.Ltd, since September 2011. The details of array system are described in the recent article published in Seismological Research Letters. Observation data for specific earthquake events are available only for an academic research.

User policy



Station locations and azimuths are listed in a table below. Sensor azimuth is the angle from magnetic North to North component of the sensor. Please correct the horizontal components. Sensors belongs to stations with a sign (*1 opposite) in a remarks column output opposite accelerograms for all three components. Please correct the sign first, and then correct the azimuth for the stations.

Station code Latitude, Longitude
(N,E; degree)
(from North)
Photo Remarks
F0138.5725, 140.9663262011/09/25 tgz
F0238.5749, 140.961802011/09/27 tgz
F0338.5768, 140.9558-72011/09/28 tgz
F0438.5784, 140.9639-52011/09/26 tgz
F0538.5734, 140.952772011/09/25 tgz
F0638.5707, 140.9604132011/09/26 tgz
F0738.5707, 140.9606102011/10/27 tgz
F0838.5747, 140.957492011/10/25 tgzobservation terminated (-2014/03/09)
F0938.5775, 140.95861642011/10/25 tgzchange sensor azimth (N008E, -2015/04/27)
F1038.5785, 140.9671132011/10/26 tgz azimuth corrected
on 2013/05/06
*1 opposite (2013/07/09-)
F1138.5818, 140.958662011/10/26 tgz
F1238.5773, 140.9574282011/11/22 tgz
F1338.5818, 140.9519-222011/11/22 azimuth corrected
on 11, Dec. 2012
F1438.5740, 140.960252011/11/23 tgzobservation terminated (-2015/04/05)
F1538.5610, 140.957262011/11/23 tgz
F1638.5722, 140.9711252011/11/25 tgz
F1738.5810, 140.962512011/11/24
F1838.5737, 140.96421082011/12/21
F1938.5754, 140.9538-22011/12/23
F2038.5778, 140.954902012/02/26 tgz*1 opposite
F2138.5868, 140.9718362012/02/28 *1 opposite
F2238.5752, 140.9592262012/02/27 tgz*1 opposite
F2338.5754, 140.9629362012/02/28 tgz*1 opposite
F2438.5803, 140.9536252012/05/12 tgz
F2538.5794, 140.9663162012/07/31 tgz
F2638.5827, 140.9743362012/08/01 tgz
F2738.5722, 140.9618152012/08/01 tgz
F2838.5814, 140.9730342012/08/02 tgz
F2938.5829, 140.9738342012/08/03 observation terminated (-2015/04/05)
F3038.5919, 140.9618422012/08/04 tgzobservation terminated (-2015/04/06)
F3138.5705, 140.9736142012/10/28 tgz*1 opposite (2015/04/05-)
F3238.5841, 140.9734302012/10/28 tgz
F3338.5779, 140.9577252012/10/29 tgz*1 opposite (2013/11/06-)
time correction is not ensured (2013/09/07-2013/11/06)
F3438.5807, 140.976722012/10/29 tgzobservation terminated (-2014/08/20)
F3538.5731, 140.9669182013/01/21 tgz
F3638.5883, 140.9556422013/03/21 tgz
F3738.5695, 140.9650122015/08/18 *1 opposite

File Format

File name consists of trigered time (YYYYMMDDhhmm) and station code (Fxx), are connected with under bar. The trigered time is represented by JST (GMT+9). For example, 201203272001_F01.dat means a data for station F01 at 20:01 on 27, Mar. 2012.

Data file is ASCII containing 3 columns, which are the data on East-West, North-South, and Up-Down components, respectively. East, North and Up are the positive direction, excepting the sensor indicated (*1 opposite) in the above table. Notice that the horizontal components are not exact East-West and North-South components. Unit is gal (cm/s/s) and all sampling rates are fixed to be 100Hz.

Event Data

triger time [GMT+9]
(YYYY/MM/DD hh:mm)
average PGA
number of
available stations