121 research outputs found

    年輪年代法と歴史学研究

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    わが国では,歴史学研究者の多くが長年にわたって待ち望んでいた年輪年代法が1985年に奈良文化財研究所によって実用化された。年輪年代法に適用できる主要樹種はヒノキ,スギ,コウヤマキ,ヒバの4樹種である。年代を割り出す際に準備されている暦年標準パターンは,ヒノキが紀元前912年まで,スギが紀元前1313年までのものが作成されており,各種の木質古文化財の年代測定に威力を発揮している。考古学においては,1996年に,大阪府池上曽根遺跡の大型建物に使われていた柱根の伐採年代が紀元前52年と判明し,従来の年代観より100年古いことから考古学研究者に大きな衝撃を与えた。これ以降も,弥生前期・中期の広島県黄幡1号遺跡や古墳中期の京都府宇治市街遺跡などからの出土木材の年輪年代を明らかにし,弥生~古墳時代にかけての土器編年に貴重な年代情報を提供した。また,古建築については法隆寺金堂,五重塔,中門をはじめ,唐招提寺金堂,正倉院正倉などに応用し,成果を確実なものにしてきた。とくに正倉院正倉部材の年輪年代調査は,長年の論争に終止符を打つ結果となり,その成果は大きい。Dating using dendrochronology, for which many historical researchers had long been waiting, was established by The National Research Institute for Cultural Properties, Nara in 1985. There are four main trees to which dendrochronology can be applied: Japanese cypress (Chamaecyparis obtusa), Japanese cedar (Cyptomeria japonica), Japanese umbrella pine (Sciadopitys verticillata) and Hiba (Thujopsis dolabrata). A master chronology established for determining age dates Japanese cypress as far back as 912 BC and Japanese cedar as far back as 1313 BC. Thus, it is proving a powerful tool in the dating of various kinds of ancient cultural properties made of wood.In the field of archaeology, in 1996 it was established that wood used for the foundations of pillars of a large building at the Ikegami-sone ruins in Osaka was felled in 52 BC. This added 100 years to the existing view of the age of the wood and came as a huge shock for archaeologists. Since then, dendrochronology has been used to date wood excavated from the Oban No. 1 site in Hiroshima Prefecture dating from Early to Middle Yayoi and from the Uji City site in Kyoto Prefecture which dates back to the middle of the Kofun period. Consequently, dendrochronology has provided information that has been invaluable for the pottery sequence covering the Yayoi through to the Kofun periods. Dendrochronology has been used with accurate results for ancient buildings, such as the main hall (kondo), five-storied pagoda (goju-no-to) and middle gate (nakamon) at Horyu-ji Temple, the main hall of Toshodai-ji Temple and the main building of the Shosoin Repository. Its effects have been significant, with one example being the dendrochronological dating of materials from the Shosoin Repository which put an end to a long-running debate

    国宝高山寺石水院部材の年輪年代測定

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    歴史的建造物由来ヒノキ材の年代判定

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    我が国に多数現存する歴史的木造建築群は,それ自体が実証編年を示しており,歴史文化的価値が非常に高い。このことから,著者らは,歴史的建造物由来古材が単なる建築史資料として重要であるばかりでなく,出自の明確な歴史的木質材料としての価値を有することに着目した。そして,それらを材料工学的試料として捉える上で必要となる古材の年代を得るための試みとして,飛鳥期から現代までの歴史的建造物由来試料9点を選定し,年輪年代と¹⁴Cウィグルマッチ法による年代,ならびに古材に関する建築史的情報とを複合的に比較検討し,それぞれの古材試料に関する基本情報を抽出した。The groups of historical wooden buildings that still exist in large numbers in Japan themselves present a verified chronology, and have extremely high historical and cultural value. From this, the authors have focused not just on the importance of old lumber sourced from historical buildings as simple objects of architectural history, but as having value as historical wooden objects of known provenance. As an attempt to obtain the age of old timber in order to use it for materials engineering samples, nine samples from historical buildings, from the Asuka period to the contemporary era, were selected and dendrochronology and 14C-wiggle matching, as well as architectural history information related to old building materials, were comparatively evaluated in a compound manner and the basic information related to each of these old lumber samples was extracted

    Seismic exploration at Fuji volcano with active sources : The outline of the experiment and the arrival time data

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    Fuji volcano (altitude 3,776m) is the largest basaltic stratovolcano in Japan. In late August and early September 2003, seismic exploration was conducted around Fuji volcano by the detonation of 500 kg charges of dynamite to investigate the seismic structure of that area. Seismographs with an eigenfrequency of 2 Hz were used for observation, positioned along a WSW-ENE line passing through the summit of the mountain. A total of 469 seismic stations were installed at intervals of 250-500 m. The data were stored in memory on-site using data loggers. The sampling interval was 4 ms. Charges were detonated at 5 points, one at each end of the observation line and 3 along its length. The first arrival times and the later-phase arrival times at each station for each detonation were recorded as data. P-wave velocities in the surface layer were estimated from the travel time curves near the explosion points, with results of 2.5 km/s obtained for the vicinity of Fuji volcano and 4.0 km5/s elsewhere

    国宝高山寺石水院部材の年輪年代測定

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