* Inactive pages will become active in due course as planning progresses. ** Closed.

If you have questions or requests, please send them by email to "excursion@inqua2015.jp".

INQUA2015 Post-congress excursions

Click to enlarge the photos.

PO-1. Obsidian sources and Upper Paleolithic technology in Hokkaido (4 days)

Outcrop of obsidian in Tokachi
Seventeen sources of geological obsidian are known in Hokkaido Islands, situated on the boundary of an oceanic plate and two continental plates – the Pacific, the North American (Okhotsk), and the Eurasian (Amurian). We will visit the sources such as Shirataki, Oketo, and Kutcharo. Additionally, we will visit several archaeological sites located within the vicinity of these geological obsidian sources and visit museums that house the abundant archaeological collections.
Date 3 - 6 August
Start Asahikawa city museum (14:00)
Finish Asahikawa station (17:00), Asahikawa Airport (17:50)
Leaders Keiji Wada and Masami Izuho
Cost 105,500 (JPY)
PO-2. Tephrostratigraphy and tephrochronology in Hokkaido: Implications for understanding eruption processes and the history of tsunami hazards (5 days)

Mashu Lake and Mashu volcano
Hokkaido is situated at the junction of two arc-trench systems, NE Japan and Kuril arcs, in both of which intense volcanism has continued since the late Miocene. We focus on various types of younger volcanoes, calderas (Shikotsu, Akan and Kutcharo), a volcanic complex (Taisetsu-Tokachi volcano group), and post-caldera volcanoes (Tarumai, Me-Akan and Atosanupuri). These volcanoes erupted tephra deposits widely distributed in Hokkaido. We investigate these deposits to reconstruct eruption and magmatic processes. There have occurred severe hazards due to not only volcanic eruptions but also large earthquakes in Hokkaido. We also focus on tsunami deposits sandwiched by tephra at the Pacific coast and a snow melted lahar in Tokachi volcano. The participants will be sharing rooms. 2nd day excursion is 6 hours mountain trekking to Tokachi-dake.
Date 4 - 8 August
Start JR Sapporo Station (north exit)
Finish Kushiro Airport
Leaders Mitsuhiro Nakagawa, Yugo Nakamura and Takeshi Hasegawa
Cost 109,400 (JPY)
PO-3. Trans-Tohoku Island Arc, tsunami, volcanism, tectonic evolution and landslide disaster in northeast Japan (5 days)

Satellite image of Tohoku Island Arc
Participants will be able to see the Quaternary evolution of the northeast Japan arc, tracing a transverse profile from the Pacific to the Japan Sea side. The tsunami disaster caused by the M9.0 inter-plate megaquake off East Japan, early to late Quaternary calderas, pyroclastics and widespread tephras as time markers distributed in and around the Ou-Backbone Range (Volcanic Front) will be shown. Neotectonics reflecting the geological structure of Plio-Pleistocene age in the inner-arc basin and Japan Sea coast will fascinate the participants. They will also visit the earthquake-induced mega-scale landslide of 2005.
Date 3 - 7 August
Start JR Sendai Station (12:15), Sendai Airport (13:15)
Finish JR Sendai Station (19:00), Sendai Airport (19:45)
Leaders Hiroshi Yagi, Tsutomu Soda, Masanobu Shishikura and Toshifumi Imaizumi
Cost 146,100 (JPY)
PO-4. Tephrochronology and magneto-stratigraphy of continuous early Quaternary marine sediment exposed along a spectacular coastal cliff, Chiba (one day)

Byobugaura coastal cliff
The Byobugaura coastal cliff, 90 km east of Tokyo, is called Eastern Dover. Along this 10 km long cliff, fine-grained continuous marine sediments are exposed, providing an ideal long-term record of the early Quaternary covering the Pleistocene/Pliocene boundary. Tephrochronological, magneto-stratigraphical and biostratigraphical studies have been carried out for these sediments during the last four decades. The excusion will introduce recent results of these studies, emphasizing tephra studies.
Date 3 August
Start JR Tokyo Station (9:30)
Finish Narita International Airport (19:00)
Leaders Takeyuki Ueki and Takehiko Suzuki
Cost 11,400 (JPY)
PO-5. The GSSP candidate section for the Lower-Middle Pleistocene Boundary on Yorogawa River (Chiba Section) (2 days)

Lower-Middle Pleistocene Boundary on the Yorogawa River
The Kazusa Group, ranging from the Lower Pleistocene to the lower Middle Pleistocene, was deposited rapidly from bathyal to shelf palaeoenvironments in the Pacific Ocean. The average sedimentation rate is about 2.0m/ky. This field trip will show the GSSP candidate section for the Lower-Middle Pleistocene Boundary on the Yorogawa-river Route (Chiba Section). The boundary is tied to a volcanic ash layer. We will be able to explain the lithofacies of large outcrops on the Matuyama-Brunhes boundary, Jaramillo sub-chron and Olduvai sub-chron; and also the changing process of magnetic polarity in detail from the Matsuyama reversed to the Brunhes normal.
Date 3 - 4 August
Start JR Tokyo station (11:30)
Finish JR Tokyo station (15:00)
Leaders Osamu Kazaoka, Kouji Okumura, Hisao Kumai, Hisashi Nirei, Makoto Okada, Yusuke Suganuma and Takeshi Yoshida
Cost 32,700 (JPY)
Detailed information
PO-6. The environmental management of the Big Kanto Groundwater Basin and the distribution of man-made strata and geopollution

Erupted sand deformation of the ground surface around Tokyo Bay caused by liquefaction-fluidization phenomena during the 2011 Tohoku Big Earthquake
Over 42 million people (1/3 of the total population of Japan) live on the Kanto plain which includes the Tokyo metropolis. The waterfront area around Tokyo Bay mostly includes both alluvium and reclaimed areas and is densely covered with houses and factories. Sediments of the Kanto basin are 2,500-3,000m thick and are of Miocene to Holocene age. The basin is also called the Kanto groundwater basin from the standpoint of the production of groundwater, natural gas and iodine. Uncontrolled use of land and resources has caused many environmental problems, (1) land subsidence, (2) liquefaction-fluidization and earthquake disasters, (3) floods caused by urbanization, (4) geo-pollution (groundwater pollution, air pollution, strata pollution), (5) waste disposal. To ensure effective use of environmental resources without causing environmental problems, monitoring systems for their management and land use have been developed. The system has 500 monitoring wells, 5000 benchmarks, seismic observatory arrays, etc.. Participants will visit typical sites mentioned above including outcrops.
For better understanding of the geological backgrounds, participation in PO-5 is recommended.
Date 4 - 5 August
Start JR Tokyo Station (13:30)
Finish Narita International Airport (18:00)
Leaders Furuno Kunio, Kazaoka Osamu, Kagawa Atsushi, Kusuda Takashi, Hiyama Tomoyo, Takeuchi Mio, Miyagi Kiichi, Ogitsu Itaru, Sakai Yutaka, Kameyama Shun, Yoshida Takeshi and Nirei Hisashi
Cost 32,200 (JPY)
canceled: If you are interested in this canceled excursion, please contact Mr. Kunio FURUNO, email:kuniofurunojp (at) gmail.com. There is a possibility that the guidance along the excursion will be personally held by the volunteer of the leaders.
PO-7. Geology and Quaternary environments of the Paleolithic site at Tategahana in Nojiri-ko (Lake Nojiri), Nagano, central Japan (one day)

The Naumann's elephant of Nojiri-ko
The Nojiri-ko Excavation has been carried out since 1962 at the Tategahana Paleolithic Site, to reconstruct the natural environment and human activity during the Last Glacial Stage. The Nojiri-ko Formation comprises fluvial and lacustrine sediments and yields many fossil remains and artifacts. The most remarkably important excavated remains were stone implements and bone tools. A spiral flake that was crushed from the humerus of the Naumann elephant, Palaeoloxodon naumanni, was evcavated from the Nojiri-ko Formation. The collected mammalian fossils belong to the Naumann elephant, Yabe’s Giant Deer and other animals.
This tour includes transportation to Lake Nojiri by chartered bus and lunch, including return by bus and no dinner.
Date 3 August
Start Nagoya Congress Center (7:15)
Finish JR Nagoya Station (21:30)
Leaders Yoichi Kondo, Yoshikatu Nakamura and Yoshihiro Takeshita
Cost 23,800 (JPY)
Detailed information
PO-8. Quaternary geology and geomorphology in the Japanese Alps (4 days)

Alpine landscape in Tateyama volcano
Glacial-periglacial landforms and landslides are widely present in the Japanese Alps (2000-3000 m ASL) and its adjacent areas because this mountain range has long been affected by rapid uplift and seismo-volcanic activities as well as humid climates. In order to discuss the Quaternary glacial, periglacial, and paraglacial histories of the Japanese Alps as mid-latitude humid mountains, we will visit some interesting places such as Kamikochi Valley, Matsumoto Basin, Tateyama volcano, etc. Participants can enjoy not only alpine and subalpine landscapes but also the Japanese rural atmosphere with hotsprings. Although we will take a chartered bus during most of the trip, two days of light trekking (5-8 hr each day, 1500-2500 m ASL) is planned. General trekking items (a medium backpack, cap/hut, shoes, rain wear, sun block, medicine for personal use, etc.) are required. The cost includes: transportation during excursion, meals according to itinerary. Please ask us for details.
Date 3 - 6 August (Changed from 3 - 7 August at 5 January)
Start Nagoya Congress Center (7:00)
Finish JR Nagoya Station (19:00)
Leaders Yoshihiko Kariya, Kuniyasu Mokudai, Tatsuto Aoki and Kotaro Fukui
Cost 101,400 (JPY)
Detailed information
PO-9. Construction of dams and its influence on the Tenryu River and Enshu Coast, central Japan (2 days)

Sakuma dam with a height of 115 m
The Tenryu River runs from the mountainous region to the Pacific coast in central Japan. Although sediment discharge in the Tenryu River was the largest in the Japanese Islands, recent dam construction caused a decrease in sediment discharge to one-third or less. In our field excursion, we visit Sakuma dam and its lake, see riverbed erosion in the downstream area, and coastal erosion of the Enshu Coast, around the river mouth. The excursion includes an 1-hour gentle river rafting with Japanese classical style boat.
Date 3 - 4 August
Start Nagoya Congress Center (8:30)
Finish JR Hamamatsu Station (Shizuoka Pref.)(17:30) to Tokyo to Nagoya (& Chubu AP)
Leaders Masaaki Shirai
Cost 48,300 (JPY)
PO-10. Tectonic geomorphology and traces of tsunami-generating earthquakes along the Enshu-nada coast and Lake Hamana, Shizuoka, Central Japan (2 days)

Land improvement on the delta, northern Hamana Lake (AD 1773)
In this excursion we will visit localities in two separate areas facing the eastern Nankai Trough: Lake Hamana, one of largest brackish lakes in Japan and the Enshunada coast. These areas lie along a plate boundary where the Philippine Sea plate subducts beneath the Honshu arc and provide excellent records of the tectonic and climatic history and related changes of human life since the Late Quaternary. Late Pleistocene marine and fluvial terraces (up to 70 m in height) demonstrate the active tectonics of these areas. The water condition and the coastal landform of Lake Hamana have been strongly controlled by sea-level change and crustal movements. Traces of historical earthquakes (M~8) and associated tsunamis that occurred along the Nankai Trough are also observed in these areas.
Date 3 - 4 August
Start Nagoya Congress Center (8:30)
Finish Chubu Centrair International Airport, Nagoya / JR Nagoya Station (17:00)
Leaders Osamu Fujiwara, Masatomo Umitsu and Eisuke Ono
Cost 32,000 (JPY)
PO-11. Lake Biwa and Lake Suigetsu: High-resolution climatic record sites (one day)

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 M-4.
Date 3 August
Start Nagoya Congress Center (7:45)
Finish Nagoya Congress Center (18:00)
Leaders Keiji Takemura, Takeshi Nakagawa and Yasufumi Satoguchi
Cost 13,900 (JPY)
Detailed information
PO-12. Influences of climate changes and human activity on the San-in coast over the last millennium (5 days)

Tottori Dunes
The coastal geomorphology of the San-in district, on the central southern Japan Sea, has evolved in response to climate changes and human activity over the last 1,000 years. The coastline exhibits several barrier dunes formed by the winter monsoons that have fluctuated. Steep rivers have supplied sediment to the coast, some catchments of which experienced drastic changes in sediment discharge related to iron mining since the Medieval Period. This field trip attempts source-to-sink examination of the San-in district via visits to river catchments, ruins of iron mining and coastal habitat, and several coastal barriers that have shown varying responses to climate changes and human activity.
Date 3 - 7 August
Start Nagoya Congress Center
Finish Chubu Centrair International Airport, Nagoya and JR Nagoya Station
Leaders Toru Tamura and Yoshinori Kodama
Cost 90,000 (JPY)
PO-13. Quaternary volcanism, tephras and associated landscapes in Kyushu Island (4 days)

Eruption of Sakurajima volcano, southern Kyushu, May 5, 2010 (Photo: H.M.)
The excursion program is designed to show a wide variety of volcanoes, associated landscapes, and the role of tephrochronology in central and southern Kyushu Island, southwestern Japan. The trip covers 4 volcanic centres encompassing huge calderas (Aso, Kakuto, Aira, and Ata), 4 Geoparks (Shimabara Peninsula, Aso, Kirishima, and Sakurajima Kinko Bay), and the Miyazaki coastal plain comprising Pleistocene marine terraces. Sites of human-related interests will also be visited: a disaster-memorial museum, an archaeological excavation site, and hot springs etc.
Coach/ferry transport costs, 3 nights of accommodation, all meals, and entrance fees are included in the field trip fee. The departure time (10:00 AM) on the first day at the Kumamoto Airport will tie in with arrival times of morning flights from Nagoya (Chubu & Komaki Airport).
Date 3 - 6 August
Start JR Kumamoto Station (8:45) or Kumamoto Airport (9:45)
Finish Kagoshima Airport (17:00) or JR Kagoshima Chuo Station (17:50)
Leaders Hiroshi Moriwaki,Toshiro Nagasako and Mitsuru Okuno
Cost 79,500 (JPY)
Detailed information
PO-14. Modern, Holocene and Pleistocene coral reefs in the Ryukyu Islands (7 days)

Ibaruma, Ishigaki Island
The Ryukyu Islands form an island arc extending from Tane-ga-shima to Yonaguni-jima. Most of the islands are rimmed by modern coral reefs and covered with Pleistocene reef-complex deposits. We will observe the biota sediments, and topography of modern coral reefs at Ishigaki-jima, South Ryukyus, where more than 350 species of corals have been reported. Then we will visit Okinawa-jima, the largest island in the Central Ryukyus, to observe the Pleistocene carbonate sequence which represents initiation and development of coral reefs in the islands.
Date 3 - 10 August
Start Naha Airport, Okinawa (18:00)
Finish Ishigaki Airport, Ishigaki Island, Okinawa (10:00)
Leaders Yasufumi Iryu, Chuki Hongo and Marc Humblet
Cost 293,300 (JPY)
PO-15. Quaternary tectonics of Taiwan (7 days)

A view to the Pu-tun-punas fan by the Lao-nong River, the largest modern debris fan in Taiwan (taken in December 2013).
The accretionary prism of Taiwan lies above the collision and subduction zones between the Eurasian and Philippine Sea plates. This field trip will aim at showing the 1999 Chichi earthquake rupture and 8/8/2009 Morakot Typoon debris flow deposits in the western Taiwan. And we will also visit the uplifted coral reef, marine terraces, plate-boundary fault, and Quaternary mélange in eastern Taiwan.
Date 3 - 9 August
Start Taiwan Tauyen international Airport, Terminal 1 and 2 (before 13:30)
Finish Taiwan Tauyen international Airport, Terminal 1 and 2 (17:30)
Leaders Wen-Shan Chen and Meng-Long Hsieh
Cost 120,000 (JPY)