JP4382273B2 - Earthquake measurement system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an earthquake measurement system capable of detecting earthquake motion and calculating a seismic intensity and the like from the value.
[0002]
[Prior art]
Conventionally, as a device that measures seismic ground motion and performs a predetermined evaluation related to earthquakes based on such measurement data, for example, obtains seismometers for the purpose of measuring the seismic intensity of earthquakes and seismic response records of the structure ground during strong earthquakes Strong seismometers for this purpose are known.
Such seismometers detect acceleration in the x-axis direction (eg, south-north direction), y-axis direction (eg, east-west direction), and z-axis direction (eg, up-down direction) generated by an earthquake inside. An A / D converter that converts analog data detected by the acceleration detector into digital data, a DSP (Digital Signal Processor) that performs seismic intensity measurement calculation, and the like. Then, the seismic intensity of the earthquake is always calculated based on the magnitude of acceleration in the three-axis directions.
[0003]
Specifically, the seismic intensity is calculated in the order of Fourier transform, filtering, inverse Fourier transform, and filtering on the acceleration data of the three components in the three-axis directions, and a vector waveform is synthesized from the calculated three components It is obtained by taking its logarithm.
The strong seismometer has the same configuration as the seismic intensity meter, and is activated when an earthquake of a magnitude greater than a preset magnitude is detected.
[0004]
[Problems to be solved by the invention]
As described above, since the seismic intensity calculation is based on the acceleration component data in the three-axis directions, if any one of the detectors detecting these accelerations malfunctions, malfunction or non-operation may occur. Yes, the reliability as a seismic intensity meter or strong seismometer is significantly reduced.
In other words, seismometers and strong seismometers are required to be able to measure reliably and accurately whenever an earthquake occurs, and to achieve higher reliability and stability than existing ones.
[0005]
An object of the present invention is to provide an earthquake measurement system that is more reliable and more stable than the prior art.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is an earthquake measurement system (for example, the earthquake measurement system 100 in FIG. 1) that measures data relating to earthquake motion, and a first detector (for example, a diagram) that detects earthquake motion from each of three axial directions . 1 of the main detector 11 to 1n), the first detector and the second detector respectively detect ground motions of the same place and the same direction (e.g., the detector 21 to 23 for backup of FIG. 1), When reliability is determined to be unreliable by reliability determination means (for example, CPU 71 in FIG. 1) for determining the reliability of data in each direction detected by the first detector and the reliability determination means to the second detected by the detector data selection means for selecting data as detection data (e.g., CPU 71 in FIG. 1) provided with a said data reliability determination means, put in each direction A difference amount between the detection result of the first detector and the detection result of the second detector is calculated, and further, the detection of the first detector in a direction in which the calculated difference amount is a predetermined value or more. The result is compared with the detection result of the first detector in a direction other than the direction, and when it is determined that the ground motion is not detected by the first detector in the direction, it is determined that the data is not reliable. It is characterized in that.
[0007]
According to the first aspect of the present invention, when the reliability determination means determines that the data detected by the first detector is unreliable data, the data selection means performs the second detection. Since the data detected by the detector is selected as detection data, if the first detector fails for some reason, the data of the second detector will be used and an earthquake will occur Even so, seismic measurements can be made reliably and accurately, and the reliability and stability can be improved further than existing ones.
Here, the earthquake measurement system is applied to all systems that measure seismic motion, such as strong seismometers, measurement seismometers, and earthquake alarm display devices.
Any detector may be used as long as it can detect earthquake motion, such as an acceleration detector, a velocity detector, and a displacement detector.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the earthquake measurement system 100 according to the embodiment of the present invention will be described.
As shown in FIG. 1, the earthquake measurement system 100 according to the present embodiment displays and stores a strong motion meter 1 that acquires a strong motion record from data relating to ground motion such as acceleration, and a strong motion record transmitted from the strong motion meter 1. The strong motion record that is configured by the external device 8 and acquired by the strong motion meter 1 is transmitted to various external devices 8 such as the display 81 and the host (computer) 83.
[0009]
The strong motion meter 1 includes n main detectors 11 to 1n, n main A / D converters 31 to 3n, a main detection unit 10 including a main DSP 5, backup detectors 21 to 23, and a backup A The D / D converters 41 to 43, the backup detection unit 20 including the backup DSP 6, the CPU 71, the ROM 72, the RAM 73, and the like.
[0010]
The main detectors 11 to 1n of the main detection unit 10 include a main detector 11 that detects acceleration in the NS (north-south) direction, a main detector 12 that detects acceleration in the EW (east-west) direction, and U It comprises a plurality of main detectors 12 to 1n that detect acceleration in the -D (vertical) direction. Among them, the main detectors 11 to 13 are installed at one place on the ground, and detect accelerations in the three-axis (north-south, east-west, up and down) directions used to calculate the seismic intensity of the earthquake.
The other main detectors 14 to 1n are installed at positions apart from the main detectors 11 to 13, respectively, and detect accelerations used for strong motion record observation.
[0011]
The main A / D converters 31 to 3n are connected to the main detectors 11 to 1n, respectively, and convert analog acceleration signals transmitted from the main detectors 11 to 1n into digital signals.
[0012]
The DSP 5 is connected to the main A / D converters 31 to 3n, and calculates values relating to seismic intensity and strong motion record observation based on the acceleration signals digitally converted by the main A / D converters 31 to 3n.
[0013]
The backup detectors 21 to 23 include a backup detector 21 that detects acceleration in the NS (north-south) direction, a backup detector 22 that detects acceleration in the EW (east-west) direction, and UD (up and down). It consists of a backup detector 23 that detects the acceleration in the direction, and is installed in the same location as the main detectors 11 to 13, and is used for calculating the seismic intensity of the earthquake. Detect acceleration.
[0014]
The backup A / D converters 41 to 43 are connected to the backup detectors 21 to 23, respectively, and convert analog acceleration signals transmitted from the backup detectors 41 to 43 into digital signals.
[0015]
The DSP 6 is connected to the backup A / D converters 41 to 43, and calculates seismic intensity and strong motion record observation values based on the acceleration signals digitally converted by the A / D converters 41 to 43.
[0016]
The backup detectors 21 to 23 have a lower accuracy and a lower failure rate than the main detectors 11 to 1n.
The reason for this is that in order to detect large earthquakes such as earthquakes, it is not necessary to have the accuracy required to detect daily fine earthquake motions. It is because it is fully satisfied. Therefore, for the backup detectors 21 to 23, for example, a detector with a small failure rate such as a speed feedback detector is used, the failure rate of the backup detectors 21 to 23 is reduced, and seismic intensity calculation data acquisition is performed. For improved reliability.
[0017]
The CPU 71 is connected to the ROM 72, the RAM 73, the DSP 5, and the DSP 6, and determines the reliability of the acceleration data detected by the main detectors 11 to 13 as reliability determination means.
Specifically, for example, the difference between the acceleration data in each direction detected by the main detectors 11 to 13 and the acceleration data in each direction detected by the backup detectors 21 to 23 is calculated, and is greater than or equal to a predetermined value. When a difference occurs, the acceleration data of the corresponding main detectors 11 to 13 (for example, the main detector 11) and the acceleration data of the other main detectors 11 to 13 (for example, the main detectors 12 and 13) Are compared to determine the reliability of the data of the main detectors 11-13.
[0018]
For example, if a failure occurs in a certain main detector when an earthquake occurs, only that main detector will not detect vibration.
Then, the CPU 71 determines that there is a logical problem in the detection result of the main detector, and determines the abnormality of the main detector in which the malfunction has occurred.
When the CPU 71 determines that at least one of the main detectors 11 to 13 is data with low reliability, the CPU 71 uses the data detected by the main detectors 11 to 13 as data selection means. The use is stopped, and the data detected by the backup detectors 21 to 23 is selected and used as processing data.
[0019]
The CPU 71 manages data transmission / reception between the strong motion meter 1 and the external device 8.
These processes by the CPU 71 are executed by using the RAM 73 as a work area while storing the program and data stored in the ROM 72 in the RAM 73.
In addition, the CPU 71 temporarily stores acceleration signals transmitted from the DSP 5 and DSP 6 and data such as calculation results calculated from these acceleration signals in the RAM 73, and stores them in an external device 8 to be described later according to a program stored in the ROM 72. Send.
When the CPU 71 receives an instruction signal from the external device 8, the CPU 71 performs a predetermined process according to this signal and a program stored in the ROM 72.
[0020]
Each external device 8 connected to the CPU 71 includes a display 81, a GPS receiver 82, a host (computer) 833, an external display 841, a memory card 85, and the like. Displays and stores data acquired by.
Hereinafter, these external devices 8 will be described.
[0021]
The display 81 is composed of a 7-segment decoder or the like, and displays seismic intensity data and acceleration data transmitted from the CPU 71.
[0022]
A GPS (Global Positioning System) receiver 82 measures highly accurate time information based on radio waves received from a satellite by a GPS antenna and transmits the time information to the CPU 71.
[0023]
The host (computer) 83 is connected to the CPU 71 via a communication port 831, a modem 832, a communication line, and a modem 833, and data transmitted from the CPU 71 is transmitted to the communication port 831, modem 832, communication line, modem 833. Sent to the host.
[0024]
The external display 84 is connected to the CPU 71 via the communication port 841 and displays data transmitted from the CPU 71.
[0025]
The memory card 85 stores data input from the CPU 71 in the internal LSI.
[0026]
In the above configuration, if an earthquake occurs, the main detectors 11 to 1n and the backup detectors 21 to 23 detect acceleration data, respectively.
At that time, the acceleration data detected by the main detectors 11 to 1n is converted into digital data by the main A / D converters 31 to 3n, and transmitted to the CPU 71 through the main DSP 5.
The acceleration data detected by the backup detectors 21 to 23 is also converted into digital data by the main A / D converters 41 to 43 and transmitted to the CPU 71 through the DSP 6.
[0027]
At this time, the CPU 71 stores the received acceleration data in the RAM 73, determines the quality of the acceleration data, and selects data to be used based on the result.
[0028]
When the CPU 7 determines that all data detected from the main detectors 11 to 1n and the backup detectors 21 to 23 are correct, the CPU 71 uses the data detected by the main detectors 11 to 1n as processing data. The acceleration data detected by the main detectors 11 to 1n and the calculation result based on the acceleration data are transmitted to a predetermined external device 8.
[0029]
When the CPU 71 determines that the data detected from at least one of the main detectors 11 to 13 (seismic intensity measurement detectors) is not normal, the CPU 71 detects the data using the backup detectors 21 to 23. The obtained acceleration data is used as processing data, and the acceleration data detected by the backup detectors 21 to 23 and the calculation result based on these acceleration data are transmitted to a predetermined external device 8.
[0030]
As described above, the seismic measurement system 1 according to the present embodiment includes the main detectors 11 to 1n and the backup detectors 21 to 23, and a failure occurs in the main detectors 11 to 13 when an earthquake occurs. For this, data detected by the backup detectors 21 to 23 is used.
For this reason, the failure rate of the detector is reduced, and stable data is acquired.
[0031]
The earthquake measurement system 100 described above determines whether the acceleration data detected from each of the main detectors 11 to 13 is good or bad by the CPU 71, and determines that the data is not reliable. Since it switches to 21-23, the reliability of data is ensured.
[0032]
Therefore, the earthquake measurement system in the present embodiment can stably acquire reliable earthquake motion data.
[0033]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the seismic measurement system in this embodiment, the main detector detects data related to seismic intensity and strong motion record observation, and the backup detector detects data related to seismic intensity calculation. The present invention is not limited, and only data related to the calculation of seismic intensity may be detected.
[0034]
In addition, the detector in the present embodiment is not limited to an acceleration detector, and may be a detector that performs detection related to earthquake motion, such as a detector such as a speedometer or a displacement meter.
[0035]
Further, the backup A / D converters 41 to 43 and the DSP 6 connected to the backup detectors 21 to 23 are not necessarily required and can be substituted by the CPU 71.
[0036]
Furthermore, in the seismic measurement system in the present embodiment, the seismic motion data detected by the detector is transmitted to various external devices, but these various external devices are not necessarily required.
[0037]
The present invention is also applied to devices including a detection unit that detects seismic motion, such as a measurement seismometer, an earthquake warning display device, and the like.
[0038]
For example, taking the measurement seismometer 200 shown in FIG. 2 as an example, the measurement seismometer 200 detects accelerations in the three axes (vertical, east-west, north-south) directions related to the calculation of the seismic intensity, and calculates the seismic intensity from the detected data. To the external device 28.
Therefore, as shown in the block diagram of FIG. 2, the measurement seismometer 200 to which the present invention is applied includes main detectors 211 to 213 that detect acceleration in three axial directions (NS, EW, UD), and Backup detectors 221 to 223 for detecting triaxial acceleration are provided, and acceleration data detected by the main detectors 211 to 213 is sent via the main A / D converters 231 to 233 and the main DSP 25. The acceleration data detected by the backup detectors 221 to 223 is transmitted to the CPU 27 via the backup A / D converters 241 to 243 and the backup DSP 26.
When an earthquake occurs, the CPU 27 determines whether the transmitted acceleration signal is good. If the data detected from the main detectors 211 to 213 is determined not to be normal, the backup detector 221 is detected. The data detected from ˜223 is adopted as processing data, and the adopted data is transmitted to various external devices.
[0039]
【The invention's effect】
According to the first aspect of the present invention, when the reliability determination means determines that the data detected by the first detector is unreliable data, the data selection means performs the second detection. Since the data detected by the detector is selected as detection data, if the first detector fails for some reason, the data of the second detector will be used and an earthquake will occur Even so, seismic measurements can be made reliably and accurately, and the reliability and stability can be improved further than existing ones.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an earthquake measurement system 100 according to the present invention.
FIG. 2 is a block diagram showing a configuration of a seismic intensity meter 200 to which the present invention is applied.
[Explanation of symbols]
100 seismic measurement system 1 strong motion meter 10 main detectors 11 to 1n main detectors 31 to 3n main A / D converter 5 main DSP
20 Backup detectors 21 to 23 Backup detectors 41 to 43 Backup A / D converter 6 Backup DSP
71 CPU
72 ROM
73 RAM
8 External equipment

Claims (1)

An earthquake measurement system that measures data related to earthquake motion,
A first detector for detecting seismic motion from each of the three axial directions ;
A second detector, each for detecting the ground motion of the first detector and the same place and the same direction,
Reliability determination means for determining the reliability of data in each direction detected by the first detector;
Data selection means for selecting data detected by the second detector as detection data when the reliability determination means determines that there is no reliability;
Equipped with a,
The data reliability determination means calculates a difference amount between the detection result of the first detector and the detection result of the second detector in each direction, and the calculated difference amount is a predetermined value. By comparing the detection result of the first detector in the above direction with the detection result of the first detector in the direction other than the direction, it is determined that the ground motion is not detected by the first detector in the direction. An earthquake measurement system that determines that the data is unreliable in the event of failure .

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