| 講演要旨(和文) | | 奥会津地熱地域（福島県柳津町）では，蒸気生産量の安定化のために涵養注水試験が行なわれている。これに伴って，流体流動把握のため，微小地震計（地表：5点，坑内：4点）が設置され，常時AE/微小地震の連続モニタリングを行なっている。2018年度に行なわれた涵養注水試験では，貯留層付近からのAE/微小地震と周辺からの近地地震について約1023イベントが受信された。そのうち地熱地域付近で発生したと考えられるAE/微小地震は271イベントだった。また，この期間において，1日の平均イベント数は，全体（AE/微小地震と近地地震の合計）33イベント，AE/微小地震約9イベントであった。今回の結果からは，注水に起因する顕著なAE/微小地震活動は見られず，試験中に対象地域内で人が感じることができる“地震”と定義されるイベントも発生しなかった。 |
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| | 講演要旨(英文) | | In the OkuAizu geothermal field (Yanaizu, Fukushima prefecture), the recharge water injection test is carried out to stabilize the steam production. Along with this, a microseismometer (ground surface: 5 points, inside hole: 4 points) was installed for continuous fluid monitoring to continuously monitor AE / micro earthquake continuously. About 1023 events for AE / micro earthquake from the reservoir layer and near earthquake from the surrounding were received in the recharge water injection test conducted in FY 2018. Among them, the AE / micro earthquake that occurred in the vicinity of the geothermal area was 271 events. Also during this period, the average number of events per day was 33 events in total (total of AE / micro earthquake and near-field earthquake), about 9 events of AE / micro earthquake. From the result of this time, no noticeable AE / microearthquake activity due to water injection was observed, and no event defined as "earthquake" which can be felt by people in the target area during the examination also did not occur. |
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