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INQUA2015 Mid-congress excursions 30th (Thu) July

Click to enlarge the photos.

M-1. 1 Day Bus Tour to Hamaoka Nuclear Power Plant, Tsunami deposits and Active faults on Omaezaki

Mt. Fuji, Suruga Bay and Omaezaki
The tour takes you to the Hamaoka Nuclear Plant, Shizuoka prefecture, located at the junction of four plates: Pacific, Philippine Sea, Eurasia and North America and tsunami deposits and active faults in the surrounding area which is tectonically very active. Tsunami deposits and active faults indicate frequent and repeated big eathquake events near the Pacific coast where the Hamaoka Nuclear Plant is located. They suggest a high risk of severe accidents for the nuclear plant just as Fukushima Daiichi in 2011. Packed lunch included.
Leaders Yugo Ono
Cost 10,000 (JPY)
Detailed information
M-2. Surface rupture associated with the 1891 Nobi earthquake and tectonic geomorphology along the Neodani fault

Neodani fault
The 1891 Mw 7.5 Nobi earthquake, one of the largest inland earthquakes in Japanese written history, was caused by rupture of the left-lateral Neodani fault and other adjacent faults in the Mino Mountains north of Nagoya. The ~80-km-long surface rupture was associated with the left-lateral offset up to ~8 m, with the ~6-m-high fault scarp at Midori, Motosu City, Gifu Prefecture, being well known for its impressive photograph taken immediately after the earthquake. We will be visiting traces of the 1891 surface rupture, including the fault scarp and trench preservation hall at Midori, as well as a variety of geomorphic signals of repetitive surface faulting along the Neodani fault. Long-sleeved shirt and long pants are recommended to avoid being bitten by mosquitos.
Leaders Heitaro Kaneda and Atsumasa Okada
Cost 13,500 (JPY)
Detailed information
M-3. Geomorphology of active fold scarps along the Yoro-Kuwana-Yokkaichi fault zone generated by historic large earthquakes

Satellite image of Yoro-Kuwana-Yokkaichi fault zone
The Yoro-Kuwana-Yokkaichi fault zone, ~30 km west of metropolitan Nagoya, is well known for the historic, M~7.7 earthquake in AD 1586, demonstrated in many drilled boreholes and seismic reflection data. Our visit includes sites of coseismic fold scarps which grew during the historic earthquakes, outcrops of deformed Quaternary strata above blind thrusts, and the 138 Tower Park in Kiso-Sansen Park from which participants can easily grasp the overall geology and geomorphology of the Nobi sedimentary basin and uplifted mountains.
Leaders Toshihiko Sugai and Tatsuya Ishiyama
Cost 13,500 (JPY)
Detailed information
M-4. Lake Biwa and Lake Suigetsu: High-resolution climatic record sites

Lake Biwa in summer
Lake Biwa is the largest and oldest lake in Japan. While the neighboring basin Lake Suigetsu has varved sediments from the past 150 kyr, Lake Biwa has a continuous record of the last million years. Therefore, examination studies of the two basins will help us understand Quaternary climate changes and tectonics at several time scales.
* The contents of this excursion are the same as PO-11.
Leaders Keiji Takemura, Takeshi Nakagawa and Yasufumi Satoguchi
Cost 13,900 (JPY)
Detailed information
M-5. Paleoseismology and tectonic geomorphology in Kyoto and its surrounding areas

Old picture of coseismic slope failure and dammed lake
We will visit tectonic scarps and terraces, sites of a destructive coseismic slope failure that produced a dammed lake and outcrops of deformed lacustrine deposits along the Hanaore fault zone at the eastern part of Kyoto, in addition to the western marginal fault zone of Lake Biwa. In Kyoto and its surrounding areas, many active faults are densely distributed, which have contributed to landform development and land use. Over a few decades, paleoseismological and tectonic geomorphological studies have revealed characteristics of active faults such as their precise location, slip sense, event age, recurrence interval, and slip rate, including correlation to historical earthquakes.
* The contents of this excursion are the same as PRE-2.
Leaders Daisuke Ishimura, Nobuhiko Sugito, Toshikazu Yoshioka, Taku Komatsubara
Cost 15,000 (JPY)
Detailed information
M-6. Geology and tephrochronology of the Ontake volcano, Nagano, central Japan

Ontake volcano
The Ontake volcano (3,067 m), is located in central Japan, is the second highest volcano in Japan. In this field trip, we will visit the site of proximal marker tephras and the view-site of the sector-collapsed wall of debris avalanche. This volcano consists of Older Ontake volcano (Middle Pleistocene) and Younger Ontake volcano (Late Pleistocene). The activity of Ontake volcano was revealed by means of volcanostratigraphy, tephrostratigraphy and K-Ar dating of lavas. Numerous tephra beds erupted from the Ontake volcano, some of these tephra are valuable marker bed for the Middle-Late Pleistocene in central Japan. Of these tephra, Pm-1 is especially famous as a marker tephra of the Late Pleistocene. The debris avalanche, "Denjo (Ontake) Kuzure", which was triggered by the 1984 earthquake occurred on the southeastern slope of Ontake volcano. This trip will take 6 hours on the bus (both ways) and lunch is Japanese food (edible wild plants and river fish etc.).
Depending on the situation of volcanic activity before the excursion, changes of route or the cancellation are possible.
Leaders Yoshihiro Takeshita and Teruki Oikawa
Cost 11,600 (JPY)
Detailed information
M-7. Prehistoric Jomon culture and the obsidian mining sites in the Central Highlands, Nagano Prefecture

The Jomon venus with mask. Courtesy the Agency for Cultural Affairs, © Tadahiro Ogawa
One-day bus tour starts from Nagoya (7:00) up to the high mountainous area of Nagano Prefecture, and visits 1)Togari-ishi Jomon Archaeological Museum, 2)Center for Obsidian and Lithic Studies, Meiji University, 3)Nagawa Obsidian Museum, 4)Jomon huge prehistoric mining sites, and back to Nagoya(ca. 20:00), including lunch. Nagano Prefecture, Central North Japan, is one of the most concentrated areas of geologic obsidian outcrops and archaeological sites of Palaeolithic and Jomon age. In particular, the Takayama area has unique obsidian mining sites with about 200 mine-pits which resemble bomb craters on the Mushikura mountain slope ca. 1,500m above sea level. Now excavating huge mine-pit is belongs to the later period of Jomon age (ca. 3,500 cal BP). There are two facilities; one is the Center for Obsidian and Lithic Studies, Meiji University, and the other is a hands-on museum of obsidian use and craftsman, Nagawa Town. For better understanding of Jomon age mining activities, we visit first at the Togari-ishi Jomon Archaeological Museum. There exhibits typical decorative Jomon potteries and terra-cotta figurines (Dogu).
Leaders Kazutaka Shimada and Jun Hashizume
Cost 18,700 (JPY)
Detailed information
M-8. Making peel specimens of sediments

Peel specimen of riverbed sediments
This one-day field trip focuses on making peel specimens of beach and river-bed sediments for school and lifelong education, as well as outcrop preservation under construction. This trip will move around Nagoya by chartered bus and includes lunch. Polyurethane resin and materials for peeling will be provided.
Leaders Takeyuki Ueki
Cost 11,600 (JPY)
M-9. The Influence of tectonic-uplift and eustatic sea-level changes on the mid-Pleistocene deposits in the Atsumi Peninsula, Aichi Prefecture, central Japan

Coastal cliff in Atsumi Peninsula
The Atsumi Peninsula is located 60 km southeast of Nagoya, facing the Enshu-nada (Pacific). The peninsula is composed mainly of the Jurassic accretionary complex as a basement and middle to late Pleistocene marine deposits. The middle Pleistocene Atsumi Group is divided into four depositional sequences (MIS 15, 13, 11, 9) which are controlled by eustatic sea-level changes and tectonic crustal movement. Our visit will include sites of large-scale cross-beds of gravelly spit facies, shell concentrated beds indicating inner bay facies, and widely traceable volcanic ash layers.
Leaders Rei Nakashima and Yoshihisa Hiroki
Cost 18,200 (JPY)
Detailed information
M-10. Landform and geology of the Ina tectonic basin and Senjojiki Cirque, Kiso Mountains, central Japan

Senjojiki Cirque
The trip is focused on the glacial geomorphology of the Senjojiki Cirque (ca. 2500 m), in the Kiso Mountains (Central Japanese Alps). The terminal moraine below the cirque has been dated as the Last Glacial Maximum (LGM) using surface exposure (10Be). This trip will allow us to enjoy the high alpine flora as well as the spectacular view of the Japanese Alps (and hopefully Mt. Fuji). We also visit the Ina tectonic basin, which is thought to originate from the uplift of the Kiso and Akaishi Mountains since the Pleistocene. Fluvial terraces are well developed in the basin due to uplift and incision of the Tenryu river. The trip will take 5 hours by bus and 1 hour in the cable car (both ways), with 2~3 hour walking in high-alpine environments and the Ina tectonic basin. Participants should bring warm field clothes and rain gear for rainy weather.
Leaders Masafumi Aoyama and Yusuke Suganuma
Cost 19,200 (JPY)
Detailed information
M-11. Fuji volcanoes and active tectonics in the Izu-Tanzawa Collision Zone

Mt. Fuji and Ashino-ko Lake in Hakone volcano
The Izu-Bonin Arc on the Philippine Sea Plate has been colliding against the Japanese Island Arc on the Eurasian Plate since the middle Miocene, where the relative convergence rate is 3-4 cm/year. Vigorous Quaternary crustal activities in this Izu-Tanzawa collision zone are characterized by rapid fault movements, explosive volcanism, and distinctive seismicity at present. Scenic and spectacular landforms are generated there. We will guide you to several areas to observe and enjoy representative volcanic bodies related to explosive tephra ejections of Mt.Fuji and Hakone Caldera Volcano, and active fault features of the Tan-na fault associated with 1930 Kita-Izu Earthquake (M7.2), using recent results of tephra and trench studies.
Leaders Takahiro Miyauchi and Takehiko Suzuki
Cost 14,300 (JPY)
Detailed information
M-12. Upper Paleolithic sites around Ashitaka and Hakone volcanoes, Shizuoka Prefecture

Ashitaka soil
An area around Ashitaka and Hakone volcanoes is well known for the dense distribution of Upper Paleolithic sites and a detailed and reliable chronology of Upper Paleolithic assemblages. More than 90 Upper Paleolithic sites have been discovered in this area. Clear stratigraphic sequences in archaeological sites in this region provide a geological base for establishing a detailed and reliable Upper Paleolithic chronology. We will visit several archaeological sites in this region and also visit a museum to observe archaeological collections.
Leaders Nobuyuki Ikeya and Takuya Yamaoka
Cost 18,400 (JPY)
Detailed information
M-13. Landforms, subsurface stratigraphy and anthropogenic modification of the Nobi Plain

Nobi Plain with the Kiso and Nagra rivers
The Nobi Plain, one of the largest coastal plains in Japan, was formed by the Kiso, Nagara, and Ibi rivers. Low-gradient alluvial fans, floodplains, and deltas occur in these fluvial systems. Local people have suffered from flooding and storm surges during heavy rains and typhoons, and have found ways to live in harmony with such disasters (e.g., construction of ring levees called “Wajyu-tei”). This trip will examine landforms, subsurface stratigraphy (observation of existing borehole cores), and anthropogenic modification of the plain. We plan to visit the Aqua Restoration Research Center, Water Eco Park, an artificial ring levee (Anpachi Town), a raised river bed at Ogura Valley, Kiso Sansen Park, and the Nagaragawa Estuary Barrage. Lunch is included in the cost.
Leaders Kazuaki Hori and Susumu Tanabe
Cost 14,000 (JPY)
Detailed information
M-14. Satoyama landscape, endemic plant habitats and traditional industrials in a hilly area at the east of the Nobi Plain

Yanami mire
A gentle hilly area at several hundred meters above sea level covers the east side of the Nobi Plain including Nagoya City. In this hilly area, ceramic industries have prospered since the Middle Ages, thanks to clay produced from local sediments. Seto, the city name in this area, is synonymous with ceramics in Japanese. Following extensive tree felling to produce fuel, almost all forest in this area changed to secondary forest called "satoyama". In these secondary forests, there are numerous small wetlands formed by seepage water. Since several endemic plants (Tokai hilly land elements) are found, these wetlands are noted as a hotspot of biodiversity. This excursion aims to review this unique natural landscape, and examine the history of relationships between human activity and nature. We plan to visit Yanami mire (one of the mires of "Tokai Hilly Land Spring-fed Mires", a registered wetland under the Ramsar Convention), Seto-gura Museum (to learn the history of local ceramic industries), and Aichi Kaisho Forest Center (to observe satoyama landscape and ruins of an old kiln). We advise you to participate with strong walking shoes and comfortable outfits. And we can eat lunch at Seto-gura Museum.
Leaders Keisuke Tomita
Cost 12,500 (JPY)
Detailed information