【摘要】 经过中国国家地震局（ＳＳＢ）和美国地质调查局（ＵＳＧＳ）的通力合作，中国数字地震台网（ＣＤＳＮ）于１９８７年１０月开始运行，记有三分向短周期ＳＰ、宽频带ＢＢ、长周期ＬＰ和超长周期ＶＬＰ（ＶｅｒｙＬｏｎｓＰｅｒｉｏｄ）４种频带的数据记录。ＣＤＳＮ的网月带中记录了数字化的ＶＬＰ地震波形数据，网月带中含有网月带月志文件、台站月志文件和ＶＬＰ数据文件，其中ＶＬＰ数据文件有数据月志和ＶＬＰ数据两个部分。网月带的物理结构是无结构的数据流，每２０００个字节为一个物理块（ＢＬＯＣＫ），每个文件由若干个ＢＬＯＣＫ组成。网月带记录类型有３种，分别是ＡＳＣＩＩ码、ＢＣＤ码和二进制数据。更多还原

【Abstract】 China Digital Seismograph Network (CDSN) has bee operated since October of 1986by the full cooperation between China State Seismological Bureau (SSB) and UnitedStates Geology Survey (USGS). Three component data of four kinds of various frequency band, short period (SP), broad band (BB), long period (LP) and very long period(VLP), are recorded. The digital VLP seismological waveform data are recorded in network-month tape in CDSN. The network-month tape includes its month log file, stationmonth log file and VLP data file, where data month log and VLP data are included inVLP data file. The physical structure in network-month tape is non-structured dataflow, in which one physical block has 2000 bytes and one file is composed of blocks.There are three kinds of record types in network-month tape, which are ASCII codeand binary data, respectively.更多还原