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 How to use the Hi-net data

▌Introduction

The Data Management Center of the National Research Institute for Earth Science and Disaster Resilience (NIED DMC) provide continuous seismic waveform and other seismological data obtained by the NIED High Sensitivity Seismograph Network (NIED Hi-net) and the other seismograph networks in Japan. NIED, Japan Meteorological Agency (JMA), and universities have started exchanging high-sensitivity seismograph data obtained by each seismic network with a specific policy for 'Exchange and Open Access of Waveform Data obtained by High Sensitivity Seismograph Observation' conducted by the Headquarters for Earthquake Research Promotion of the Japanese government. Our website provides not only the NIED Hi-net waveform data but also the other high-sensitivity seismograph data.

If you have some questions and/or comments, contact us from this page.


▌Usage of Data on the Hi-net Website

[Report of your results]

Users MUST report their results to the NIED DMC, when they obtain some results by using the data provided by our website fully or partially. This is because statistics of the data usage are essential to understand necessity and benefit of the data observed by NIED or other organizations. In order to maintain and improve the seismographic networks, these reports are indispensable. We would like to ask users to understand these points and importance.

There is a possibility that we will stop our services, if users do not report their results to us even though they used the data provide by the NIED Hi-net website.
  • When your papers, abstract for scientific meeting or conference, or report were published, send them to us.
  • When you conducted researches for purposes of disaster mitigation, damage estimation and assessments and wrote some reports, send them to us.
  • To use the data provided from our website in your contract job, you are required to inform your client about the usage of the data provide by us. Your client or you have to report your results to us.
  • If you did not make reports in a printed matter or users' reports are confidential, let us know objective or other possible information about your work via this page.
    When you explicitly inform us that your work is confidential, we never show any information about your work to others.
  • When you use the data provided from our website for purposes other than scientific research, such as consultation, education, usage in local governments, development of commercial products, patent, you are required to report your results to us.
  • In the case that you used the data for your study without any reports or you just looked the waveform data for personal use, we would be grateful if you let us know outline of your study and/or your impression about the data or our services via this page.

[Prohibition against re-distribution of the data]
We, NIED, have copyrights for all data and images served from our website, except for waveform data whose copyrights belong to each providing organization. This rule is valid to the data already unavailable on our website. We strictly prohibit any re-distribution of these data in any manner. You can 'publish' your own results which were made by using the data downloaded from our website. In this case, you are required to obey the following requirements.
See [Prior permission and explicit acknowledgement].

[Prior permission and explicit acknowledgement]
In order to use waveform data provided by the organizations other than NIED (e.g., JMA, universities), you may be required to obtain a prior permission by each organization. Check requirements of each organization carefullyand obey them.
When you used the data provided by our website fully or partially and would publish their results, you MUST list all organizations which provided the data and explicitly acknowledge about the usage of the data in the "acknowledgement" section.

When you want to refer to the NIED Hi-net system in your paper and/or reports, you should check the following papers and add them to your reference list.

   Y.Okada, K.Kasahara, S.Hori, K.Obara, S.Sekiguchi, H.Fujiwara, and A.Yamamoto, 2004, Recent progress of seismic observation networks in Japan -Hi-net, F-net, K-NET and KiK-net -,Earth, Planets and Space, 56, xv-xxviii.

   K.Obara, K.Kasahara, S.Hori and Y.Okada, 2005, A densely distributed high-sensitivity seismograph network in Japan: Hi-net by National Research Institute for Earth Science and Disaster Prevention, Review ofScientific Instruments, 76, 021301-doi:10.1063/1.1854197.


▌Earthquake Information

[Preliminary catalog by the Hi-net automatic system]

We, NIED, automatically detect earthquakes and estimate their hypocenters using the NIED Hi-net data. You can see our preliminary results as the earthquake catalog, which is updated every three hours. To access this catalog, you have to make user registration via this page.
   Origin Time     Origin time of earthquake [YYYY-MM-DD hh:mm:ss.sss]
   Oterr           Error of origin time in seconds
   Lat             North latitude of hypocenter in degrees
   Yerr            Hypocenter location error for NS direction in kilometers
   Long            East longitude of hypocenter in degrees
   Xerr            Hypocenter location error for EW direction in kilometers
   Dep             Depth of hypocenter in kilometers
   Derr            Depth error of hypocenter in kilometers
   Mag             Earthquake magnitude
   
This catalog is a quick report by the NIED Hi-net automatic hypocenter determination system. You should refer to the governmentally official earthquake information announced by the Japan Meteorological Agency (JMA).

+ JMA unified earthquake catalog (for registered users only)
+ Arrival-time data and focal mechanism catalog from JMA unified earthquake catalog (for registered users only)

JMA determines earthquakes' hypocenter locations and their magnitudes in the cooperation with the Ministry of Education, Culture, Sports, Science and Technology (MEXT). In this integrated analysis for hypocenter determination, JMA uses not only their data but also data from NIED, universities, and other organizations. Thus, we refer to the hypocenter catalog provided by JMA as the "JMA unified earthquake catalog". On the NIED Hi-net website, we provide the JMA unified earthquake catalog to the public after approximately five days from the earthquake occurrence. Since JMA often revises this catalog, we strongly recommend you to use the final catalog provided by the JMA website .

If you use the JMA unified hypocenter catalog in your research, study and/or job, you are required to acknowledge as the following example in your paper and/or report:
The earthquake catalog used in this study is produced by the Japan Meteorological Agency, in cooperation with the Ministry of Education, Culture, Sports, Science and Technology. The catalog is based on seismic data provided by the National Research Institute for Earth Science and Disaster Resilience, the Japan Meteorological Agency, Hokkaido University, Hirosaki University, Tohoku University, the University of Tokyo, Nagoya University, Kyoto University, Kochi University, Kyushu University, Kagoshima University, the National Institute of Advanced Industrial Science and Technology, the Geographical Survey Institute, Tokyo Metropolis, Shizuoka Prefecture, Hot Springs Research Institute of Kanagawa Prefecture, Yokohama City, and Japan Agency for Marine-Earth Science and Technology.

Format of the JMA unified earthquake catalog provide via our web-site is shown as follow:
   Origin Time  Origin time of earthquake [YYYY-MM-DD hh:mm:ss.sss]
   OTerr        Error of origin time in seconds
   Lat          North latitude of hypocenter in degrees
   LatErr       Hypocenter location error in latitude in minutes
   Long         East longitude of hypocenter in degrees
   LonErr       Hypocenter location error in longitude in minutes
   Dep          Depth of hypocenter in kilometers
   Derr         Depth error of hypocenter in kilometers
   Mag          Earthquake magnitude
                J: JMA magnitude
                M: Body-wave magnitude
                S: Surface-wave magnitude
   Region       Name of epicenter region
   

In order to download the JMA unified hypocenter catalog, you have to register via this page.
File format of the arrival-time data and focal mechanism data are here.


▌Event Waveform Data Download [Registered Users Only]

NIED DMC provide waveform data including earthquakes as 'Event Waveform Data' extracted from continuous waveform database obtained by NIED Hi-net, JMA, universities, and other organizations. As making 'Event Waveform Data' is based on the JMA unified hypocenter catalog, 'Event Waveform Data' includes waveform data at the stations using the hypocenter location of the JMA catalog.

If you publish your results using the waveform data downloaded from our website, you MUST acknowledge all data sources you used on your publications and send your publications to the NIED DMC.
In detail, check this page.


▌Continuous Waveform Data Download [Registered Users Only]

You can download continuous seismic waveform data recorded by NIED, JMA, universities and other organizations, after you make a free registration from this page. Continuous waveform data is divided into one-minute segment and saved using "WIN32" format. Continuous waveform data from April 1st, 2004 to now are available on our website. We set the total data size you can download at once is up to 50 MB because of the limitation of our network environment. If you need the data from October, 2000 to March 31st, 2004, read "How to Use the Old Waveform Data" first, and fill out this form.

If you publish your results using the waveform data downloaded from our website, you MUST acknowledge all data sources you used on your publications and send your publications to the NIED DMC.
In detail, check this page.

In order to use the downloaded "WIN32" waveform data, you need an appropriate information file called "channels table". This file includes information about the location and sensitivity of sensors and LSB value of A/D converter. In the archive file you downloaded, you can see a "channels table" file. The format of the channel table file is based on "WIN system" originated by Earthquake Research Institute (ERI), the University of Tokyo. Detailed information for "WIN system" is in the website of Earthquake Observation Center in ERI (in Japanese). The station information in the "channels table" file may be changed without any announcements because of arepair or replacement of borehole sensors.

NIED manages parameters at the NIED Hi-net/F-net stations only. As NIED Hi-net and F-net stations have station codes such as N.xxxH and N.xxxF, respectively, you can distinguish these stations from other networks. For the other stations, each organization manages the station information installing by itself. On our website, the most suitable channels table is automatically generated from all station information provided by each organization after acceptance of your request.


▌How to Use the Old Waveform Data

We are accumulating seismic waveform data observed by not only NIED but also JMA, universities and other organizations, and open them to the public. You can download these waveform data with your own user ID and password via our website. However, the continuous waveform data before March 31st, 2004 are not available on the website because of our system limitations.

If you want to use the non-accessible data from our website, you can get them at the NIED DMC located at Tsukuba, Japan.

+ We need about one-month for schedule adjustment and data preparation after receiving data submission form.
+ If data size you requested becomes too large, we may deny your data request.
+ We prohibit commercial use of our old data.

If you publish your results using the waveform data downloaded from our website, you MUST acknowledge all data sources you used on your publications and send your publications to the NIED DMC.
In detail, check this page.


[Data Period]
  • NIED Hi-net was established October, 2000.
  • NIED Kanto-Tokai crustal activity observation network data are available since April, 2001. If you want to use older data before March, 2001, ask us for details.
  • Waveform data provided by JMA and universities, and other organizations are available since June, 2002.
  • Data archiving system of NIED F-net was unified with the Hi-net system in FY2002. F-net data after April, 2003 are available on this website. You can get all F-net data from the F-net website, of course.
  • All continuous waveform data after April 1st, 2004 and event waveform data after June 3rd, 2002 are available on our website.

[How to get the old data]
  • Before coming to the NIED DMC, you need an appointment with our staff. If not, we cannot provide the data.
  • Our business time is from 9:00 am to 5:00 pm weekdays (Monday to Friday except for the Japanese national holidays).
  • When you copy the data to your own media, you can use our Linux PC. Tools for data managements are constructed on Linux PCs. You need the basic skills to operate a Linux/UNIX PC.
  • The time you need to copy the data strongly depends on the media you selected.
  • You have to prepare some media to copy the data you requested. We can accept external hard drives (USB 2.0 / Network connection), Blu-ray, DVDR, CD-R.

In order to obtain non-accessible data from the website, you should fill the data submission form and send it to us. If you are a student, you need to provide the E-mail address of your supervisor. Please write the purpose/objectives of your data request. We can advise you about the data you request. After receiving your data submission form, we will send an e-mail to you and explain how to get the data.
NOTE: In the data submission form, we require you to list the date you want to come to NIED. However, it is sometimes hard to accommodate the requested data because of our schedule. Please understand this limitation.


▌Continuous Waveform Images

We draw images of the continuous seismic waveform recorded at the each NIED Hi-net station every hour. For each image, one-minute (60-second) traces are plotted in order, from top to bottom, at the same scale shown in the upper right corner. In these seismograms, amplitudes are expressed as the velocity of ground motion (nm/s).

You can view waveform images for data after 0:00 on May 1, 2007.

Images are automatically generated with two hours delay. These images are in PNG format, and you can download high resolution postscript images (compressed in zip format). Not all the images are available due to some unexpected problems.

This service may be suspended without prior notice due to system updates or maintenance.


▌Data File Format

All waveform data provided from our website are in the 'WIN32' data file format. Utility programs to convert WIN32 files into WIN files or SAC files are available from the web page of WIN32 tools (pages for registered users only). When you find bugs in these tools, please report them via this page.

   [Geodetic System]
  In our website, all hypocenters and station locations are given in the Japanese Geodetic Datum 2000 (JGD2000).


▌Other important information

NIED Hi-net website provides waveform data obtained by NIED and other organizations including JMA and universities.
If you publish your results using the waveform data downloaded from our website, you MUST acknowledge all data sources you used on your publications and send your publications to the NIED DMC.
In detail, check this page.

NIED retains copyrights of all the materials on this web site except as expressly the copyright owner indicated. You cannot redistribute any of the contents, documents or data provided by our website without our permission. We have no responsibility whatsoever for any direct or indirect damage or loss caused by the usage of the materials provided by our website.

The following is our address. Use this address when you send us your papers, results and other comments obtained by using the data we provided.

    High Sensitivity Seismograph Network Laboratory, Network Center for Earthquake, Tsunami and Volcano,,
    National Research Institute for Earth Science and Disaster Resilience,
    3-1 Tennodai, Tsukuba, Ibaraki 305-0006, JAPAN.











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We, NIED, do not deliver any e-mails of immediate seismic information obtained by the AQUA system.
In addition, please understand that we prohibit the redistribution of the seismic data. For more information, please read How to use the Hi-net data and FAQ.
High Sensitivity Seismograph Network Laboratory, Network Center for Earthquake, Tsunami and Volcano,
National Research Institute for Earth Science and Disaster Resilience.
3-1 Tennodai, Tsukuba City, Ibaraki Prefecture, 305-0006, JAPAN
Copyright © National Research Institute for Earth Science and Disaster Resilience, All rights Reserved.