KiK-NET and K-NET flatfile with automatically processed ground motions

Ground-motion flatfiles are commonly used to develop ground motion models (GMMs) and for systematical analysis of ground motions over a wide range of distances and earthquake magnitudes. A flatfile is organized as a table of properties and various intensity measures of earthquake waveforms, including data processing parameters. Here we present a comprehensive processed ground-motion flatfile containing data from the Kyoshin (K-NET) and Kiban-Kyoshin (KiK-net) networks operated by National Research Institute for Earth Science and Disaster Resilience (NIED) (2019) in Japan (Okada et al., 2004; Aoi et al., 2011). This flatfile contains 914,628 ground motions from 18,018 events recorded by 1,749 stations. Out of these, 434,898 ground-motions are from KiK-net and 479,730 from K-net. The events were recorded between June 1996 and September 2024, covering distances up to 1200 km and magnitudes between 2.5 and 9. The ground motions have been automatically processed, and metadata describing each event and record are provided in the flat file.

An overview of the flatfiles and the processing steps to derive the reported ground-motion parameters is provided in this report. Further details and discussion about the flatfile compilation can be found in the corresponding publication: Loviknes, K., von Specht, S., Lilienkamp, H., Händel, A., and Cotton, F. (2025). Harmonized KiK-net and K-NET flatfile for systematic analysis of earthquake ground motions (submitted to Seismica, February 2025).

地震动平文件（Ground-motion flatfiles）通常被用于构建地震动模型（ground motion models, GMMs），并可开展不同距离与地震震级范围内的地震动系统分析。平文件以表格形式组织，收录地震波形的各类属性与多种强度指标，同时包含数据处理参数。本研究发布一套经过全面处理的地震动平文件，数据源自日本地球科学与防灾研究所（National Research Institute for Earth Science and Disaster Resilience, NIED）运营的Kyoshin（K-NET）与Kiban-Kyoshin（KiK-net）台网，相关台网背景可参见Okada等（2004）与Aoi等（2011）的研究，该台网的运营信息可参阅NIED（2019）的相关资料。该平文件共收录由1749个台站记录的18018次地震事件对应的914628条地震动记录，其中434898条来自KiK-net台网，479730条来自K-NET台网。本次收录的地震事件记录时间跨度为1996年6月至2024年9月，覆盖距离范围可达1200km，震级区间为2.5至9。所有地震动记录均已完成自动化处理，平文件中同时提供了描述各次地震事件与单条记录的元数据。

本报告概述了该平文件的整体情况，以及推导报告中所提及地震动参数所需的处理流程。关于平文件编制的更多细节与讨论，可参阅对应发表文献：Loviknes, K.、von Specht, S.、Lilienkamp, H.、Händel, A.与Cotton, F.（2025）。《用于地震动系统分析的标准化KiK-net与K-NET平文件》（已提交至Seismica，2025年2月）。

搜集汇总

背景与挑战

背景概述

该数据集是一个包含KiK-NET和K-NET网络自动处理的地面运动数据的flatfile，涵盖了1996年至2024年间日本地区18,018次地震事件的914,628条地面运动记录。数据集提供了地震波形、强度测量及处理参数，适用于地面运动模型开发和系统性地震分析。