自治体連携は、小規模自治体がデジタルアーカイブ（以下DA）構築に取り組む上での障壁となるノウハウやリソースの不足を補い、事業の効率性と効果を高める方法と期待される。しかし、自治体連携によるDA構築の事例はまだ少なく、同方法の課題と可能性は十分に検討されていない。そこで本発表では、福島県

地方の広域7町村（柳津町・三島町・金山町・昭和村・只見町・南会津町・檜枝岐村）によるDA構築の試み「デジタルアーカイブ準備室」の実践紹介を通い、自治体連携型DA構築の検討の出発点としたい。

全国有数の豪雪地帯という環境と旧南山御蔵入領としての文化・歴史、電源立地としての共通利害で結ばれた7町村によるDA構築は、同地域の文化資源管理全体の基盤整理事業として期待される。しかしその実現には、議論の基盤となる共通認識の醸成、意思決定過程の明確化、作業の徹底した省力化、データ作成・保管環境の整備等の課題が残されている。

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The Okuaizu geothermal field is located in the western part of the Aizu district, Fukushima prefecture, northeast Japan. A geothermal investigation in the area was commenced by Mitsui, Mining and Smelting Co., Ltd.(MMS) in 1974. The Okuaizu Geothermal Co., Ltd.(OAG), a subsidiary company of MMS, Mitsui Construction Co., Ltd. and Toshiba Corporation, took over this exploration in 1983.
OAG has drilled fourteen production wells and three reinjection wells so far. The production zone of the field is formed by two fault systems, Chinoikezawa fault system and Sarukurazawa fault system. The reinjection zone is in the Oizawa fault system. These three fault systems have NW-SE strikes and are steeply dipping to NE. The Production wells are drilled by positive displacement control drilling to get many feed points in these declined faults. Major feed points are at a depth from 1, 000 to 2, 600m. The formation temperature at these depths is 200 to 350°C. Geothermal reservoirs governed by these fault systems are estimated to have a potencial to continue supplying steam to a 75MWe power station for 30 years. The production wells produce steam and water mixture. The steam is separated and supplied to a 65MWe power station. The commercial operation of power station began in May, 1995 and is operated by Tohoku Electric Power Co., Inc. An operational peculiarity in the Okuaizu field is that separated water containing dissolved silica is diluted with the overflow water from the cooling tower of power station before reinjection to avoid the scaling problem in the reinjection wells.

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Although the electric power generation using geothermal energy is classified as renewable energy, in the process to reach some renewable level of production there is often a considerable decline in steam production, and it causes an economical problem at several geothermal power plants in the world, including Japan. In the Okuaizu geothermal field in Fukushima prefecture, The Yanaizu Nishiyama Geothermal Power plant of the Tohoku Electric Power Company started operating by 65MWe in 1995, and Okuaizu Geothermal Co., Ltd. produces the steam used by this operation. Despite the fact that the steam production decreased in 2000 soon after the production had started, which caused the power generation output to fall until 38MWe, it succeeded in recovering up to 45MWe by now. From now on, it is needed to take measures that do not let the electric power to go below 45MWe. On the whole, the production decline trend of the Okuaizu geothermal field as well as almost all the geothermal fields in the world is to be harmonic trend. However, since a complicated factor is involved in each geothermal well, in many cases, a decline trend cannot be approximated with exponential or harmonic function curve. That the natural decline curve accompanying the pressure fall of the whole reservoir, as well as the decline or the increase curve by temporary cause and the overlap that is peculiar to each well make prediction more difficult. The writer examined the decline curve of each well in the Okuaizu geothermal field and concluded that there are three typical curves in this field: (1) the parabola decline curve by the physical blockade in the well bore by carbonate or sulfate scale, (2) the sharply irregular trend by the physical blockade of the geothermal fluid passing in the reservoir by mud water and cuttings and (3) the harmonic decline curve accompanying the pressure fall of the whole reservoir. The measure for the case (1), which is the well bore stimulation using hydrochloric acid was done successfully. For the case (2), which is the well bore stimulation using river water, was done with fruitful result. Enhanced Geothermal Systems, which means injecting water into the reservoir, are going on of preliminary tests as the measure for the case (3); the return current is not recognized yet.

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要旨:新型コロナウイルス感染症への有効な対策として，全世界でワクチン接種が進められている。

在宅医療センターは福島県立宮下病院の一部門であり，柳津町・三島町・金山町・昭和村の4町村において，ワクチン集団接種と巡回接種の支援を行った。これら4町村と在宅医療センターは2021年3月よりワクチン接種に関する協議を開始し，5月からワクチン接種が実施された。4町村の集団接種は2021年5月から8月にかけて計20回実施され，在宅医療センターは全ての集団接種で問診や接種，接種後の経過観察などを担当する支援を行った。のべ2,290名が接種を行い，接種後に対応を要したケースは14件だった。うち4件で抗アレルギー薬の処方を行い，2件は医療機関の受診をすめた。巡回接種では79名が接種を受け，接種後に対応を要したケースはなかった。ワクチン接種の準備においては先行して接種を実施していた会津医療センターへの視察の実施や，住民に配布する資料の作成に関する助言など，前例のない事業に取り組む各町村の負担を軽減する点にも重点をおいた。また今回の取り組みには，前年に三島町の一地区で実施されたインフルエンザワクチンの集団接種の知見と経験が生かされた。今後は今回の取り組みで深められた各町村や医療機関との連携をもとに，新型コロナウイルスワクチンの3回目接種の実施も念頭に置きつつ，地域住民の健康と安心を守るための継続的な活動が4町村から在宅医療センターには期待されている。

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本研究では，持続可能な森林利用について森林資源を継続的に最大限利用するための計画と定義し，福島県

地域を対象に伐出工程の林業機械の生産性について評価した。地域の森林空間情報をもとに持続可能な森林利用に必要な各年の伐出量を導出した。次に三島町西方地区において，複数の林業機械の組み合わせである伐出システムを設計し労働生産性を分析した。その後，地域全体にこの労働生産性を適用し，持続可能な森林利用のための所要人員数を分析した。結果，地域においては年間160 ～ 180 ha を継続的に伐出・造林する必要があった。三島町西方地区での伐出システムの生産性評価の結果，急傾斜林地では3.3 ～ 8.3 m ³ /person-day，緩傾斜林地では38 ～ 53 m ³ /person-day の労働生産性を示した。森林を伐出するための必要人員は，はじめの50 年間は34 ～ 110 人， 50 年目以降は34 ～ 76 人となった。労働生産性について他地域との比較を行ったところ，緩傾斜林地ではオーストリア等の林業先進国と同等程度の労働生産性であった。一方，急傾斜林地では現況のわが国と同等かそれ以上の労働生産性であり，林業先進国と同程度の生産性の実現のためには林内路網の拡充や実働時間の見直し等の施策が必要である。

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道路沿いの看板等と車の駐車台数を用いた簡便な指標にもとづき、生物多様性に関連する森林の価値及び利用実態について地域間及び天然林・人工林の間で比較した。その結果、双方の指標とも類似の地域差を示した。特用林産物の採取はと阿武隈山系の天然林で多く、釣りはと阿武隈のみで観察され、筑波と沖縄・奄美では行楽・山歩き等が半数以上を占めた。また、自然保護関係は沖縄・奄美が最も多く、人工林では天然林に比べて林業と釣り以外の種別が少なかった。森林の価値や利用の度合に大きな差があることは政策の方向性に明確な地域差をつけることの必要性を示唆している。

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A new soil-gas geochemical exploration method called "Fingerprint" was developed by KLUSMAN and VOORHEES (1983) for the direct detection of hydrocarbons. It has been proved to be very effective and technically advantageous over conventional geochemical methods to detect buried fault/fracture. In this technique, soil-gas is adsorbed on activated charcoal and is analyzed by Curie point desorption mass spectrometry. New interpretation technique has been introduced to extend applicability of the technique to geothermal exploration and various field tests have been performed since 1985. In this paper, basic ideas and the results of our interpretation technique on Fingerprint data for fault/fracture detection and geothermal reservoir definition are explained:
(1) Fault/fracture detection: "Gas feature diagram" (HIGASHIHARA et al., 1988) is a plot of cluster number on log-transformed Total Modified Ion Count (TMIC) vs High Mass Gas Ratio (HMGR) diKgram after clustering all mass spectra into several categories. This diagram is used to distinguish anomalous population which indicates existence of fault/fracture from the background population. The anomaly which is plotted in the high TMIC and high HMGR area and the background which is plotted in the low TMIC and low HMGR area are clearly divided by a nonpopulated zone. All the members of anomalous population are classified into the different cluster categories of mass spectrum pattern from those of background population.
(2) Geothermal reservoir definition: Newly developed interpretation techniques using gas feature diagram are also applied to the Okuaizu geothermal field. In a geothermal area, the catagenesis zone (VASSOYEVICH et al., 1970; where heavy hydrocarbons are inferred to be generated) is located at higher levels in the crust due to the high temperature gradient. At first, anomalous population which is due to fault/fracture should be eliminated since they do not represent an effect from geothermal reservoir. It was found that the data from the Okuaizu geothermal reservoir zone tend to fall into the high TMIC and high HMGR area compared with the other background data of the same area on the gas feature diagram.

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地熱地域に分布する下部中新統滝沢川層を主な対象として，貯留槽深度における，現在の地熱活動による母岩の変質を記載するとともに，変質に伴う化学成分の移動傾向を明らかにし，変質帯の成因を考察した． 滝沢川層は地熱系の貯留槽深度（地表下1000～2000m) および地熱系外西方の地表に広く分布し，流紋岩～デイサイトの溶岩および同質火山砕屑岩からなる． 地熱系外の滝沢川層は，イライト，緑泥石を特徴鉱物とし基質の脱ハリ，粘土鉱物化，方解石化，黄鉄鉱化を伴う広域的な続成変質を受けている． 地層温度約100℃以上の領域を現在の地熱系の温度影 響範囲内（「地熱系内」）とみなすと，そこに分布する滝沢川層には，中新世の広域続成変質に現世の地熱変質が重複した結果，四つの変質帯，すなわちイライト・緑泥石＋帯ーイライト帯，カオリナイト帯，混合層粘土鉱物帯が形岐されている．--- ---変質帯と地熱系の地質・温度・水理構造や流体の化学性状などを合わせて考察すると，系内にみられる多様な変質帯は，それぞれが系内に分化した物理化学条件やその変化に対応して形成されたと考えられる．すなわち，イライ卜・緑泥石＋帯はC02ガスに富む高塩濃度の地熱流体が貯留槽中を移動しつつ周辺母岩中に浸透することにより，イライト帯は相対的に透水’性の高い岩石中を地熱流体が沸騰しつつ浸透することにより，カオリナイト帯は貯留槽深度周辺における気液分離で生じたC02 ガスが浅層の地下水に吹き込むことで生じた低温の炭酸酸性水と母岩との反応により，混合層粘土鉱物帯はカオリナイト帯が形成された場の最も外側で低温の浅層地下水により，それぞれ形成された．

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In the Okuaizu geothermal field, we carried out continuous self-potential (SP) measurements in 2000, 2002 and 2004 to monitor field-wide shut-ins associated with regularly-scheduled maintenance of the Yanaizu-Nishiyama geothermal power plant. Thirteen stations for SP measurements were distributed in the central area of the Okuaizu field, at each of which two or three non-polarizing electrodes were set at one meter depth to check the station reliability. SP changes of 5 to 10 mV associated with the shut-in and re-start of production wells were detected at a few stations located in a low resistivity area in the vicinity of the Sarukurazawa fault. In order to evaluate the observed SP variations, numerical simulations of changes in reservoir conditions due to fluid production and successive “SP-postprocessor” calculations were performed based upon a simplified reservoir model. The reservoir region of the model is divided into deeper and shallower parts, both of which are represented as MINC double-porosity media. In the final model, the matrix permeability of the deeper reservoir needs to be smaller than 10^-20 m² to reproduce the rapid increase of the produced fluid enthalpy as observed in the first a few years of the power plant operation. In contrast, it is required to assign the matrix permeability to be 10^-18 m² or more for the shallower reservoir to reproduce the observed SP changes associated with the short-term shut-ins. This combination of deeper and shallower reservoir properties also reproduces long-term SP changes revealed by repeated SP measurements in 1996 and 1998, and long-wavelength micro-gravity decline between 1997 and 2000. In conclusion, continuous SP measurement to detect short-term SP changes such as associated with field-wide shut-ins is thought to provide additional useful constraints against which reservoir models can be calibrated.

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In considering climate change mitigation measures, it is important to consider woody biomass such as forest resources sustainably. This study aims to evaluate woody biomass for heating consumption of households considering the amounts of available woody biomass in the Okuaizu region of Fukushima Prefecture. GHG emissions of households heating systems such as kerosene stove, air conditioner with high or low energy efficiency, heating systems that use woody biomass resource are evaluated and compared.

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近年全国各地で地域の見直し，再生を目的とする自地域学活動が盛んに行われている。本稿では，福島県地方で活動する「会津学」を対象とし，自地域学がいかなる理念を持ち，具体的にどのような活動を実践しているのか，活動に参加する主体とその実践に着目して検討した。
「会津学」では地域誌『会津学』の刊行を通して，地域で生きる人々や生活のあり方を，聞き書きを中心とした手法で表現し記録している。活動の中心人物であるE氏とK氏の姿勢からは，過疎化の進行するの中にあって，地域で生きていくための術を懸命に見つけ出そうとする両氏の強い思いが読み取れる。またそれ以外の参加者たちも，E氏やK氏の姿勢に影響を受けながら，自身の身近な生活に目を向け聞き書きを行っている。
研究会活動や『会津学』の編集が行われる，書房を中心とした参加者たちのネットワークと，E氏やK氏の，『会津学』は次世代の人々に贈るべき手引書である，という強い信念が，大部の『会津学』を現在まで刊行させ続けるひとつの源泉となっている。

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Sulfide scales were collected from a test well of the Oku-Aizu geothermal field. Veinlets composed of similar sulfide minerals in the country rocks were also obtained from the drilled cores. Both were deposited from the compressed geothermal hot water in this area. These minerals are listed in Table 1. The analyses of the geothermal water are shown in Table 4. From the analytical data, the pH of the geothermal fluid is calculated to be 4.47 at 250°C in the case of activity coefficient equals to unity.
Two kinds of rock alteration are recognized in this area. The one is alteration caused by the neutral to alkaline hot water. The other is due to the acid hot water. The minerals of both alterations are shown in Table 3. The rocks along fissures containing the present compressed geothermal fluid are subjected to neutral to alkaline alteration. From these facts, the relation log fo2 pH-log f _s2 of the environment of the geothermal fluid is shown in Fig.9. The acid alteration occurs sporadically in this area. The acid alteration would be referred to the vapor-dominated system, separated by boiling from the compressed hot geothermal fluid. It might condense to acid hot water during cooling.
In Japan, the epithermal gold deposits are classified into two types. The one is gold (silver) -quartz (adularia) vein, surrounded by the rocks suffered neutral to alkaline alteration; adulariazation, sericitization and/or chloritization. The other is the massive silicified rock containing gold, which is surrounded by the rocks subjected to acid alteration; kaolinization and alunitization. The both types of gold deposits might be attributed to the same phenomena as the two kinds of geothermal fluids stated above.

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