JP5073515B2 - Earthquake disaster prevention system - Google Patents

Earthquake disaster prevention system Download PDF

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JP5073515B2
JP5073515B2 JP2008013378A JP2008013378A JP5073515B2 JP 5073515 B2 JP5073515 B2 JP 5073515B2 JP 2008013378 A JP2008013378 A JP 2008013378A JP 2008013378 A JP2008013378 A JP 2008013378A JP 5073515 B2 JP5073515 B2 JP 5073515B2
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文雄 市川
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Lapis Semiconductor Co Ltd
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本発明は、気象庁又は２次配信機関（例えば、（特定非営利活動法人）リアルタイム地震情報利用協議会、以下「ＲＥＩＣ」という。）から配信される緊急地震速報を利用して地震の到来前に、半導体工場等のプラントにおける人の避難のための警報発報、ガス・薬品等の供給を遮断する等して、大きな地震の際の被害を防止或いは軽減するための地震防災システム、特に、配信される緊急地震速報に含まれる誤報の対策技術に関するものである。   The present invention uses an earthquake early warning distributed from the Japan Meteorological Agency or a secondary distribution organization (for example, (Non-Profit Organization) Real-time Earthquake Information Utilization Council, hereinafter referred to as “REIC”) before the arrival of an earthquake. Earthquake disaster prevention system to prevent or reduce damage in the event of a big earthquake by, for example, issuing alarms for evacuation of people in semiconductor factories and other plants, shutting off the supply of gas and chemicals, etc. This is related to countermeasures against false alarms included in the earthquake early warning.

従来、地震防災システムに関する技術としては、例えば、次のような文献に記載されるものがあった。   Conventionally, as a technique related to an earthquake disaster prevention system, for example, there are those described in the following documents.

特開２００７−１０８０１２号公報JP 2007-108012 A 特開２００７−２９８４４８号公報JP 2007-298448 A

特許文献１には、気象庁又はＲＥＩＣから配信される緊急地震速報を利用して地震の到来前に、半導体工場等のプラントにおける警報発報、ガス・薬品等の供給を遮断する等して、地震の被害を防止或いは軽減する地震防災システムの技術が記載されている。   In Patent Document 1, an earthquake early warning that is distributed from the Japan Meteorological Agency or REIC is used to notify the earthquake, shut off the supply of gas, chemicals, etc. in the plant such as a semiconductor factory before the earthquake arrives. The technology of the earthquake disaster prevention system that prevents or reduces the damage is described.

地震波は、初期微動である縦揺れ（プライマリ波、これを「Ｐ波」という。）と、主要振動である横揺れ（セカンダリ波、これを「Ｓ波」という。）とに分けられる。Ｐ波は、伝播速度が５〜７ｋｍ／ｓと速く、これに対してＳ波は、伝播速度が３〜４ｋｍ／ｓと遅いが大きな揺れを起こし、Ｐ波の発生からＳ波の到着までの時間差は、１０秒（ｓｅｃ）前後が多い。全国各地の地震の観測地域には、地震波形を観測し発信するための地震観測網が設置され、この地震観測網から発信される情報に基づき、気象庁又はＲＥＩＣから緊急地震速報が配信されている。緊急地震速報は、震源地付近で検知したＰ波の初動データを使って求めた震源位置、マグニチュード、及び地震発生時間を含む震源情報で、瞬時に各速報受信地域へ伝送することで、遅れてくるＳ波の到達予想時刻、予想震度を事前に算出し、知らせる。 Seismic waves can be divided into longitudinal tremors (primary waves, which are referred to as “P waves”), which are initial tremors, and lateral tremors (which are referred to as “S waves”), which are main vibrations. The P wave has a high propagation speed of 5 to 7 km / s , while the S wave has a slow propagation speed of 3 to 4 km / s but causes a large fluctuation, and the arrival of the S wave from the generation of the P wave. The time difference until is often around 10 seconds (sec). Seismic observation networks for observing and transmitting earthquake waveforms are installed in earthquake observation areas throughout Japan, and emergency earthquake bulletins are distributed from the Japan Meteorological Agency or REIC based on information transmitted from this earthquake observation network. . The earthquake early warning is a source information including the location, magnitude, and earthquake occurrence time obtained using the initial motion data of the P wave detected in the vicinity of the epicenter. Estimated arrival time and predicted seismic intensity of the coming S wave are notified in advance.

特許文献１の地震防災システムでは、半導体工場等の防災対象区域（ユーザ地点）において、緊急地震速報を受信して震度、地震到達時間を算出する。配信される緊急地震速報には、ある確率で誤報（実際に地震が発生してないのに地震発生情報を配信）が含まれる。この誤報対策として、ユーザが防災対象区域の敷地内に複数台のＰ波地震計を設置し、緊急地震速報の受信とユーザ設置のＰ波地震計信号との論理積（以下「ＡＮＤ」という。）を取ることにより防止している。但し、Ｐ波地震計１台の設置では、Ｐ波地震計の故障、近傍での振動ノイズにより発生した地震のＰ波を正確に測定できない場合もあるので、Ｐ波地震計を例えば３台設置してＰ波発生の有無を判定し、３台中２台がＰ波を検出した場合にはＰ波発生有りと判定し、緊急地震速報とのＡＮＤを取ることにより、緊急地震速報の誤報対策を行っている。   In the earthquake disaster prevention system of Patent Document 1, an earthquake early warning is received and a seismic intensity and an earthquake arrival time are calculated in a disaster prevention target area (user point) such as a semiconductor factory. The earthquake early warning that is distributed includes misreporting (distribution of earthquake occurrence information even though no earthquake actually occurs) with a certain probability. As a countermeasure against this misinformation, the user installs a plurality of P-wave seismometers in the site of the disaster prevention target area, and the logical product (hereinafter referred to as “AND”) of receiving the earthquake early warning and the user-installed P-wave seismometer signal. ) To prevent it. However, if one P-wave seismometer is installed, it may not be possible to accurately measure the P-wave of an earthquake caused by a P-wave seismometer failure or nearby vibration noise. For example, three P-wave seismometers are installed. If two of the three units detect a P wave, determine that a P wave has occurred and take an AND with the earthquake early warning to take measures against false alarms. Is going.

又、特許文献２では、複数台のＰ波地震計（災害センサ）でそれぞれ検出された複数の検出信号に対する多数決で、Ｐ波発生の有無を判定する災害情報取得配信装置の技術が記載されている。   Patent Document 2 describes the technology of a disaster information acquisition / distribution device that determines the presence / absence of a P wave by majority vote for a plurality of detection signals respectively detected by a plurality of P wave seismometers (disaster sensors). Yes.

従来の特許文献１、２に記載された地震防災システムにおいて、Ｐ波地震計を複数台（例えば、３台）用いていたのは、１台故障しても２台残るからであり、又、３台のうち２台のＡＮＤ条件としていたのは、１台が誤作動しても誤検出を防ぐことができるからである。しかしながら、Ｐ波地震計を３台設置する構成では、Ｐ波地震計等を含めたシステム構成部品数が多いので、配線作業及び設置作業等が煩雑になってシステム製造費用が高くなるという課題があった。   In the conventional earthquake disaster prevention systems described in Patent Documents 1 and 2, a plurality of P-wave seismometers (for example, 3 units) were used because two units remained even if one unit failed, The reason that the AND condition of two of the three units is used is that erroneous detection can be prevented even if one unit malfunctions. However, in the configuration in which three P-wave seismometers are installed, the number of system components including the P-wave seismometer is large, so that there is a problem that wiring work and installation work become complicated and the system manufacturing cost increases. there were.

本発明の地震防災システムでは、緊急地震速報受信システムと、第１及び第２のＰ波地震計と、論理和（以下「ＯＲ」という。）回路と、ＡＮＤ回路とを有している。   The earthquake disaster prevention system of the present invention includes an emergency earthquake early warning receiving system, first and second P-wave seismometers, a logical sum (hereinafter referred to as “OR”) circuit, and an AND circuit.

ここで、前記緊急地震速報受信システムは、地震発生による震源位置、マグニチュード、及び地震発生時間を含む緊急地震速報が送られてくると、前記緊急地震速報を受信して震度及び地震到達までの時間を計算し、前記計算結果が所定の震度閾値レベルを超えるか否かを判定し、前記判定結果が前記所定の震度閾値レベルを超えるときには震度信号を出力するものである。前記第１及び第２のＰ波地震計は、前記地震発生により到来するＰ波をそれぞれ検出するものである。前記ＯＲ回路は、前記第１及び第２のＰ波地震計の検出結果に対するＯＲを求め、前記第１及び第２のＰ波地震計のうち少なくとも１台が前記Ｐ波を検出したときにはＰ波検出有りの出力信号を所定時間保持してＰ波検出信号を出力する回路である。更に、前記ＡＮＤ回路は、前記震度信号と前記ＯＲ回路の出力するＰ波検出信号とのＡＮＤを求め、前記震度信号が有り、且つ、前記Ｐ波検出信号が有りのときには、保護対象の動作を停止する制御信号を出力する回路である。 Here, the emergency earthquake bulletin receiving system receives the emergency earthquake bulletin when the earthquake early warning including the location of the earthquake, the magnitude, and the earthquake occurrence time is received, and the seismic intensity and time until the earthquake arrives. Is calculated, and it is determined whether or not the calculation result exceeds a predetermined seismic intensity threshold level. When the determination result exceeds the predetermined seismic intensity threshold level, a seismic intensity signal is output. The first and second P-wave seismometers respectively detect P waves that arrive due to the occurrence of the earthquake. The OR circuit obtains an OR for the detection results of the first and second P-wave seismometers, and when at least one of the first and second P-wave seismometers detects the P-wave, This is a circuit for holding the output signal with detection for a predetermined time and outputting the P-wave detection signal . Further, the AND circuit obtains an AND of the seismic intensity signal and the P wave detection signal output from the OR circuit. When the seismic intensity signal is present and the P wave detection signal is present, the operation to be protected is performed. This circuit outputs a control signal to be stopped .

本発明の地震防災システムによれば、２台のＰ波地震計の検出結果をＯＲ回路でＯＲを取り、このＯＲ回路の出力信号と緊急地震速報受信システムの出力信号とを、ＡＮＤ回路でＡＮＤを取ることにより、保護対象の動作又は停止を制御しているので、緊急地震速報に誤報が含まれていても、この誤報を簡単且つ的確に防止できる。しかも、Ｐ波地震計の台数を減らすことができ、システム構成部品数の削減に伴い、配線作業及び設置作業等が簡易になってシステム製造費用を低減できる。   According to the earthquake disaster prevention system of the present invention, the detection result of two P-wave seismometers is ORed by an OR circuit, and the output signal of this OR circuit and the output signal of the emergency earthquake warning receiving system are ANDed by an AND circuit. Since the operation or stop of the protection target is controlled by taking the error, even if the earthquake early warning includes an erroneous report, the erroneous report can be easily and accurately prevented. In addition, the number of P-wave seismometers can be reduced, and with the reduction in the number of system components, wiring work, installation work, etc. can be simplified and system manufacturing costs can be reduced.

地震防災システムでは、２台のＰ波地震計を設置し、この２台のＰ波地震計でそれぞれ検出された検出信号をＯＲ回路でＯＲを取る。更に、このＯＲが取られたＰ波検出信号と、緊急地震速報受信システムで受信された緊急地震速報からの震度信号とを、ＡＮＤ回路でＡＮＤを取ることにより、警報装置や防護機器を動作させる構成にしている。   In the earthquake disaster prevention system, two P-wave seismometers are installed, and detection signals detected by the two P-wave seismometers are ORed by an OR circuit. Further, the alarm device and the protective device are operated by ANDing the P-wave detection signal obtained by the OR and the seismic intensity signal from the earthquake early warning received by the earthquake early warning receiving system by an AND circuit. It has a configuration.

（実施例１の構成）
図１は、本発明の実施例１を示す地震防災システムの概略の構成図である。
この地震防災システムは、例えば、半導体工場等の防災対象区域に設置され、気象庁又はＲＥＩＣから配信される緊急地震速報（例えば、震源位置、マグニチュード、及び地震発生時間等を含む震源情報）１を受信する緊急地震速報受信システム２と、ユーザにより半導体工場等の防災対象区域に設置される２台の第１、第２のＰ波地震計３−１，３−２とを備えている。緊急地震速報受信システム２は、衛星回線、専用回線等を介して送られてくる緊急地震速報１を受信する受信部２ａと、この受信部２ａで受信した緊急地震速報１から震度及び地震到達までの時間を計算し、この計算結果が所定の震度閾値レベルを超えるか否かを判定し、この判定結果が所定の震度閾値レベルを超えるときには震度信号Ｓ２を出力する計算判定部２ｂ等とを有している。計算判定部２ｂは、コンピュータのソフトウェア、又は演算回路及び比較回路等の個別回路（ハードウェア）により構成されている。 (Configuration of Example 1)
FIG. 1 is a schematic configuration diagram of an earthquake disaster prevention system showing Embodiment 1 of the present invention.
This earthquake disaster prevention system is installed in a disaster prevention target area such as a semiconductor factory and receives an emergency earthquake bulletin (for example, earthquake source information including the location, magnitude, and earthquake occurrence time) 1 delivered from the Japan Meteorological Agency or REIC. The earthquake early warning receiving system 2 to be used, and two first and second P-wave seismometers 3-1 and 3-2 installed in a disaster prevention area such as a semiconductor factory by a user. The earthquake early warning receiving system 2 includes a receiving unit 2a that receives an earthquake early warning 1 sent via a satellite line, a dedicated line, and the like, and from the earthquake early warning 1 received by the receiving unit 2a to the seismic intensity and the arrival of the earthquake. And a calculation determination unit 2b that outputs a seismic intensity signal S2 when the determination result exceeds a predetermined seismic intensity threshold level. is doing. The calculation determination unit 2b is configured by computer software or individual circuits (hardware) such as an arithmetic circuit and a comparison circuit.

第１、第２のＰ波地震計３−１，３−２は、防災対象区域内に設置され、Ｐ波を検出し検出信号Ｓ３−１，Ｓ３−２をそれぞれ出力するものであり、加速度センサ等で構成され、この出力側に、ＯＲ回路４が接続されている。ＯＲ回路４は、出力保持回路４ａを有し、２つの検出信号Ｓ３−１及びＳ３−２のＯＲ処理を行い、その２つの検出信号Ｓ３−１，Ｓ３−２のうち少なくとも１つが出力されたときには（即ち、２台のＰ波地震計３−１，３−２のうち少なくとも１台がＰ波を検出したときには）、「Ｐ波検出有り」のＰ波検出信号Ｓ４を出力保持回路４ａにより所定時間保持して出力する回路であり、ＯＲ処理部がゲート回路等で構成され、出力保持回路４ａがフリップフロップ回路等で構成されている。 The first and second P-wave seismometers 3-1 and 3-2 are installed in the disaster prevention target area, detect P-waves, and output detection signals S3-1 and S3-2, respectively. An OR circuit 4 is connected to the output side. The OR circuit 4 has an output holding circuit 4a, performs OR processing of the two detection signals S3-1 and S3-2, and at least one of the two detection signals S3-1 and S3-2 is output. Sometimes (that is, when at least one of the two P-wave seismometers 3-1 and 3-2 detects a P-wave), a P-wave detection signal S4 “P-wave detected” is output by the output holding circuit 4a. A circuit that holds and outputs for a predetermined time , the OR processing unit is configured by a gate circuit or the like, and the output holding circuit 4a is configured by a flip-flop circuit or the like.

計算判定部２ｂ及びＯＲ回路４の出力側には、ＡＮＤ回路５が接続されている。ＡＮＤ回路５は、計算判定部２ｂから出力される震度信号Ｓ２と、ＯＲ回路４から出力されるＰ波検出信号Ｓ４とのＡＮＤを求め、震度信号Ｓ２が出力され、且つ、震度信号Ｓ２が出力される時刻までにＰ波検出信号Ｓ４が出力されているときには（即ち、「Ｐ波検出信号Ｓ４が有り」のときには）、保護対象の動作又は停止を制御する制御信号Ｓ５を出力する回路であり、ゲート回路等で構成され、この出力側に、保護対象（例えば、制御システム）１０が接続されている。 An AND circuit 5 is connected to the output side of the calculation determination unit 2 b and the OR circuit 4. The AND circuit 5 obtains an AND between the seismic intensity signal S2 output from the calculation determination unit 2b and the P wave detection signal S4 output from the OR circuit 4, and outputs the seismic intensity signal S2 and the seismic intensity signal S2 is output. This is a circuit that outputs a control signal S5 for controlling the operation or stop of the protection target when the P wave detection signal S4 is output by the time when the signal is output (that is, when “P wave detection signal S4 is present”). The protection target (for example, control system) 10 is connected to the output side.

制御システム１０は、制御信号Ｓ５を受信すると、例えば、人の安全確保のために地震発生を知らせる警報装置１１を動作させると共に、２次災害防止のために防護機器（例えば、ガス・薬品等の供給を遮断する機器や、露光機、拡散炉等の生産装置を停止させる機器）１２を動作させる装置であり、コンピュータのソフトウェア、又は個別回路（ハードウェア）により構成されている。   When the control system 10 receives the control signal S5, for example, the alarm system 11 that notifies of the occurrence of an earthquake is operated to ensure the safety of humans, and protective devices (for example, gas, chemicals, etc.) are used to prevent secondary disasters. This is a device that operates a device 12 that shuts off the supply and a device that stops a production device such as an exposure machine or a diffusion furnace, and is configured by computer software or individual circuits (hardware).

（実施例１の動作）
図２は、図１の地震防災システムの動作を示すフローチャートである。
ステップＳＰ１で、防災対象区域の地震防災システムの動作が開始すると、ステップＳＰ２−１で、緊急地震速報受信システム２内の受信部２ａにおいて緊急地震速報１の受信待ち状態になると共に、ステップＳＰ２−２で、Ｐ波地震計３−１，３−２においてＰ波発生待ち状態になる。地震が発生すると、全国に張り巡らされた地震観測網の震度計によりＰ波が検知され、気象庁により震源位置、及びマグニチュード、地震発生時間が予測され、これらの予測値を含む震源情報が、緊急地震速報１としてＲＥＩＣから各防災対象区域へ衛星回線や専用回線等を介して配信される。 (Operation of Example 1)
FIG. 2 is a flowchart showing the operation of the earthquake disaster prevention system of FIG.
When the operation of the earthquake disaster prevention system in the disaster prevention target area starts in step SP1, in step SP2-1, the receiving unit 2a in the emergency earthquake warning receiving system 2 enters a state of waiting for receiving the earthquake early warning 1, and step SP2- 2, the P wave seismometers 3-1 and 3-2 enter the P wave generation waiting state. When an earthquake occurs, P-waves are detected by seismometers in the seismic observation network spread throughout the country, the location of the earthquake, the magnitude, and the time of occurrence of the earthquake are predicted by the Japan Meteorological Agency. The earthquake early warning 1 is distributed from the REIC to each disaster prevention target area via a satellite line or a dedicated line.

ステップＳＰ２−１で、配信された緊急地震速報１を受信部２ａが受信すると、ステップＳＰ３で、計算判定部２ｂにより、受信された緊急地震速報１を基に、Ｓ波の震度、地震到達までの時間が計算され、更に、ステップＳＰ４で、計算判定部２ｂにより、その計算結果が所定の震度閾値レベルを超えると、震度信号Ｓ２がＡＮＤ回路５へ出力される。   When the receiving unit 2a receives the distributed earthquake early warning 1 in step SP2-1, in step SP3, the calculation determination unit 2b determines the seismic intensity of the S wave and the arrival of the earthquake based on the received emergency earthquake early warning 1. Further, when the calculation determination unit 2b exceeds the predetermined seismic intensity threshold level in step SP4, the seismic intensity signal S2 is output to the AND circuit 5.

一方、ステップＳＰ２−２で、２台のＰ波地震計３−１，３−２のうち少なくとも１台がＰ波の発生を検出すると、この検出信号Ｓ３−１，Ｓ３−２のうち少なくとも１つがＯＲ回路４へ出力され、このＯＲ回路４によりＯＲ処理されてＰ波検出信号Ｓ４がこのＯＲ回路４内の出力保持回路４ａに一時保持されてＡＮＤ回路５へ出力される。   On the other hand, when at least one of the two P-wave seismometers 3-1 and 3-2 detects the occurrence of a P-wave in step SP2-2, at least one of the detection signals S3-1 and S3-2. Is output to the OR circuit 4 and is subjected to OR processing by the OR circuit 4, and the P-wave detection signal S 4 is temporarily held in the output holding circuit 4 a in the OR circuit 4 and output to the AND circuit 5.

ステップＳＰ５で、ＡＮＤ回路５により、計算判定部２ｂから出力された震度信号Ｓ２と、ＯＲ回路４内の出力保持回路４ａから出力されたＰ波検出信号Ｓ４とがＡＮＤ処理され、震度信号Ｓ２が出力され、且つ、この時刻までにＰ波検出信号Ｓ４が出力されているときには（即ち、「Ｐ波検出信号Ｓ４が有り」のときには）、ステップＳＰ６で、制御信号Ｓ５が制御システム１０へ出力される。   In step SP5, the AND circuit 5 performs AND processing on the seismic intensity signal S2 output from the calculation determination unit 2b and the P wave detection signal S4 output from the output holding circuit 4a in the OR circuit 4, and the seismic intensity signal S2 is obtained. When the P wave detection signal S4 has been output by this time (that is, when “P wave detection signal S4 is present”), the control signal S5 is output to the control system 10 in step SP6. The

この結果、制御システム１０により、人の安全確保のために警報装置１１が動作して地震発生が報知されると共に、２次災害防止のために防護機器１２が動作してガス・薬品等の供給が遮断され、露光機、拡散炉等の生産装置も停止され、その後、ステップＳＰ７で、動作が終了する。   As a result, the control system 10 operates the alarm device 11 to ensure the safety of people and notifies the occurrence of an earthquake, and the protective device 12 operates to prevent secondary disasters and supplies gas and chemicals. Is shut off, and production apparatuses such as an exposure machine and a diffusion furnace are also stopped, and then the operation ends in step SP7.

（実施例１の効果）
本実施例１の地震防災システムによれば、次の（ａ）、（ｂ）のような効果がある。 (Effect of Example 1)
The earthquake disaster prevention system according to the first embodiment has the following effects (a) and (b).

（ａ） ２台のＰ波地震計３−１，３−２を設置し、この２台のＰ波地震計３−１，３−２でそれぞれ検出された検出信号Ｓ３−１及びＳ３−２をＯＲ回路４でＯＲを取り、このＯＲが取られたＰ波検出信号Ｓ４と、緊急地震速報受信システム２で受信された緊急地震速報１からの震度信号Ｓ２とを、ＡＮＤ回路５でＡＮＤを取ることにより、警報装置１１や防護機器１２を動作させる構成にしている。そのため、緊急地震速報１に誤報が含まれていても、この誤報を簡単且つ的確に防止できる。しかも、Ｐ波地震計３−１，３−２の台数を減らすことができ、システム構成部品数の削減に伴い、配線作業及び設置作業等が簡易になってシステム製造費用を低減できる。   (A) Two P-wave seismometers 3-1 and 3-2 are installed, and detection signals S3-1 and S3-2 detected by the two P-wave seismometers 3-1 and 3-2, respectively. OR circuit 4 takes an OR, P-wave detection signal S4 from which this OR is taken, seismic intensity signal S2 from earthquake early warning 1 received by earthquake early warning receiving system 2, AND circuit 5 performs AND Thus, the alarm device 11 and the protective device 12 are operated. Therefore, even if the earthquake early warning 1 includes an erroneous report, the erroneous report can be easily and accurately prevented. In addition, the number of P-wave seismometers 3-1 and 3-2 can be reduced, and with the reduction in the number of system components, wiring work, installation work, and the like are simplified, and system manufacturing costs can be reduced.

（ｂ） 本実施例１では、２台のＰ波地震計３−１，３−２のうち１台がＰ波を誤検出した場合には、ＯＲ回路４により、Ｐ波地震計による検出有りと判断される虞がある。しかし、Ｐ波地震計の誤検出の場合には、緊急地震速報１が来ていない場合が殆どであると考えられるため、技術的に問題はなく、むしろ、このような問題に比べて前記（ａ）の効果が著しく大きい。   (B) In the first embodiment, when one of the two P-wave seismometers 3-1 and 3-2 erroneously detects the P-wave, the OR circuit 4 detects the P-wave seismometer. May be judged. However, in the case of erroneous detection of a P-wave seismometer, it is considered that there is almost no case where the Earthquake Early Warning 1 has not arrived, so there is no technical problem. Rather, the above (( The effect of a) is remarkably large.

（変形例）
なお、本発明は、上記実施例１に限定されず、緊急地震速報受信システム２や、制御システム１０により制御される警報装置１１及び防護装置１２を、図示以外の種々の構成に変更することが可能である。 (Modification)
The present invention is not limited to the first embodiment, and the emergency earthquake warning receiving system 2 and the alarm device 11 and the protective device 12 controlled by the control system 10 can be changed to various configurations other than those illustrated. Is possible.

本発明の実施例１を示す地震防災システムの概略の構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the earthquake disaster prevention system which shows Example 1 of this invention. 図１の地震防災システムの動作を示すフローチャートである。It is a flowchart which shows operation | movement of the earthquake disaster prevention system of FIG.

符号の説明Explanation of symbols

１ 緊急地震速報
２ 緊急地震速報受信システム
２ａ 受信部
２ｂ 計算判定部
３−１，３−２ Ｐ波地震計
４ ＯＲ回路
５ ＡＮＤ回路
１０ 制御システム DESCRIPTION OF SYMBOLS 1 Earthquake early warning 2 Emergency earthquake early warning reception system 2a Reception part 2b Calculation determination part 3-1, 3-2 P wave seismometer 4 OR circuit 5 AND circuit 10 Control system

Claims (2)

地震発生による震源位置、マグニチュード、及び地震発生時間を含む緊急地震速報が送られてくると、前記緊急地震速報を受信して震度及び地震到達までの時間を計算し、前記計算結果が所定の震度閾値レベルを超えるか否かを判定し、前記判定結果が前記所定の震度閾値レベルを超えるときに震度信号を出力する緊急地震速報受信システムと、
前記地震発生により到来するＰ波をそれぞれ検出する第１及び第２のＰ波地震計と、
前記第１及び第２のＰ波地震計の検出結果に対する論理和を求め、前記第１及び第２のＰ波地震計のうち少なくとも１台が前記Ｐ波を検出したときにはＰ波検出有りの出力信号を出力する論理和回路と、
前記論理和回路の前記出力信号を所定時間保持してＰ波検出信号を出力する保持回路と、
前記震度信号と前記Ｐ波検出信号との論理積を求め、前記震度信号が有り、且つ、前記Ｐ波検出信号が有りのときには、保護対象の動作を停止する制御信号を出力する論理積回路と、
を有することを特徴とする地震防災システム。 When an earthquake early warning including the location, magnitude, and time of occurrence of an earthquake is sent, the earthquake early warning is received, the seismic intensity and the time to reach the earthquake are calculated, and the calculation result is a predetermined seismic intensity. An emergency earthquake warning receiving system that determines whether or not a threshold level is exceeded and outputs a seismic intensity signal when the determination result exceeds the predetermined seismic intensity threshold level;
First and second P-wave seismometers that respectively detect P-waves arriving due to the occurrence of the earthquake;
An OR with respect to the detection results of the first and second P-wave seismometers is obtained, and when at least one of the first and second P-wave seismometers detects the P-wave, an output with P-wave detection An OR circuit for outputting a signal;
A holding circuit that holds the output signal of the OR circuit for a predetermined time and outputs a P-wave detection signal;
An AND circuit that obtains a logical product of the seismic intensity signal and the P wave detection signal, and outputs a control signal for stopping the operation of the protection target when the seismic intensity signal is present and the P wave detection signal is present; ,
An earthquake disaster prevention system characterized by comprising: 前記緊急地震速報受信システムは、
前記緊急地震速報を受信する受信部と、
前記受信部の出力信号から前記震度及び前記地震到達までの時間を計算し、前記計算結果が所定の震度閾値レベルを超えるか否かを判定し、前記判定結果が前記所定の震度閾値レベルを超えるときには信号を出力する計算判定部と、
を有することを特徴とする請求項１記載の地震防災システム。 The earthquake early warning receiving system is
A receiver for receiving the earthquake early warning;
Calculate the seismic intensity and the time to reach the earthquake from the output signal of the receiving unit, determine whether the calculation result exceeds a predetermined seismic intensity threshold level, and the determination result exceeds the predetermined seismic intensity threshold level A calculation determination unit that sometimes outputs a signal;
The earthquake disaster prevention system according to claim 1, further comprising:
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