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1 REPORT OF HYDROGRAPHIC AND OCEANOGRAPHIC RESEARCHES No.49 December, 2012 Hydrographic surveys Hydrographic Survey Team responding to Disasters Abstract After emergent obstruction surveys to re-open affected ports, JHOD has been carrying out hydrographic surveys to revise the nautical charts for the affected ports. By the end of March, the bathymetric surveys have covered the highest-priority areas such as passages and proximity of berths for each of affected ports. In advance of issuing revised nautical charts, JHOD provided mariners with Seafloor information maps based on the smooth sheets immediately after finishing survey data analyses, supporting the economic activities and the recovery activities in devastated areas. Table 96

2 Table Hydrographic surveys conducted in FY for revising charts of tsunami affected ports. Numerals above and below each port s name indicate survey days including transits and survey days in each port, respectively. Table Table m DGPS DGPS 97

Hydrographic Survey Team responding to Disasters Table List of hydrographic reference points/gsi GPS stations of which post seismic positions were recalculated by long baseline GPS analyses in

3 Hydrographic Survey Team responding to Disasters Table List of hydrographic reference points/gsi GPS stations of which post seismic positions were recalculated by long baseline GPS analyses in reference to Shimosato Station in Wakayama Prefecture. GPS GPS Bernese Table DGPS BM Fig EM Kongsberg DGPS BM Fig Result of long baseline analyses. Upper : Horizontal displacement of Kinkasan DGPS station relative to Shimosato station due to the earthquake. Lower : Chart for hydrographic surveys, showing recalculated position of the benchmark Sendai Ko BM in Sendai Shiogama port Sendai section. Fig A G A B E EM m m PDR EM EM 98

Blue and red lines indicate track lines of S/V Kaiyo and its onboard craft, respectively.

4 Hydrographic surveys Fig Area of the st survey in Sendai Shiogama port Sendai section with ships track lines. Blue and red lines indicate track lines of S/V Kaiyo and its onboard craft, respectively. Fig Area of the nd survey in Sendai Shiogama port Sendai section by the onboard craft of S/V Tenyo. cm EM A B E EM SeaBat PDR JX JX Fig JX m JX A B Fig 99

This map shows the location of sea bottom obstacles pink dots and SeaBat bathymetric

5 Hydrographic Survey Team responding to Disasters Fig m Fig Results of the rd survey in Sendai Shiogama port Sendai section. This map shows the location of sea bottom obstacles pink dots and SeaBat bathymetric image along the off shore passage. PDR Fig SeaBat PDR Fig Bathymetric map of Sendai Shiogama port Sendai section based on all the surveys. Fig 100

6 Hydrographic surveys Fig Bathymetric map of Sendai Shiogama port Shiogama section. m m m m m No m No m PDR EM 101

port. Fig Locations of sunken ships detected

Fig SeaBat PDR Fig Fig A sunken pleasure boat

7 Hydrographic Survey Team responding to Disasters Fig Area of the st survey in Onahama port. Fig Locations of sunken ships detected with multibeam echo sounder SeaBat. See Fig and Fig. Fig Area of the nd survey in Onahama port. Fig SeaBat PDR Fig Fig A sunken pleasure boat Upper : bathymetric image, Lower : photograph after salvage. The location of the discovery is shown in Fig. 102

Hydrographic surveys Fig Bathymetric image of a sunken small

The location of the discovery is shown in Fig.

Red dots indicate locations of GPS observation sites.

8 Hydrographic surveys Fig Bathymetric image of a sunken small boat with its photograph after salvage. The location of the discovery is shown in Fig. GPS Fig Area of the rd survey in Onahama port. Red dots indicate locations of GPS observation sites. Figs SeaBat PDR Fig GPS Fig Area of the th survey in Onahama port. Red lines indicate coast line surveyed. SeaBat PDR Fig 103

Fig m m EM PDR A B C Fig A B Fig Survey lines of S/V Kaiyo during the st survey cruise in Kamaishi port

9 Hydrographic Survey Team responding to Disasters Fig Bathymetric map of Onahama port, based on all the survey results. Fig m m EM PDR A B C Fig A B Fig Survey lines of S/V Kaiyo during the st survey cruise in Kamaishi port red line : surveyed, blue line : planned. A black dotted line and a white rectangle indicate the locations of Fig and Fig, respectively. C PDR m D E E F G Fig D E F G Fig m m Fig A C A B 104

Hydrographic surveys Fig Survey lines of the

Fig Area surveyed during the nd survey in Kamaishi

Fig Bathymetric map around the submerged part of

10 Hydrographic surveys Fig Survey lines of the onboard craft of the S/V Kaiyo red line : surveyed, blue line : planned. The location of this map is shown in Fig. Fig Area surveyed during the nd survey in Kamaishi port. Fig Bathymetric map of Kamaishi port. Fig Bathymetric map around the submerged part of the Kamaishi breakwater. The location of this map is shown in Fig. D SeaBat PDR Fig E F G Fig 105

11 Hydrographic Survey Team responding to Disasters m m m SeaBat PDR A I Fig A H A B I F B m A H Fig E m Fig G H m m F m m Fig A H SeaBat Fig Bathymetric map of Ishinomaki port. A H Fig Distribution of sea bottom obstructions in Area A and H of Ishinomaki port. Red circles indicate foul bottom. 106

This obstruction protrudes about m above the seafloor with the water depth of m.

12 Hydrographic surveys F m m Fig Bathymetric image of a seabottom obstruction discovered in Area F. This obstruction protrudes about m above the seafloor with the water depth of m. C E PDR Fig t SeaBat PDR Fig Bathymetric map of Ofunato port. Red lines indicate coast lines surveyed. Photo Coast line survey left and middle and a damaged quay right. 107

13 Hydrographic Survey Team responding to Disasters Photo Fig m m m m m SeaBat PDR Fig Survey area planned in Hachinohe port. Photo Sheets of vinyl tangled in the propeller. A Q Fig Q m m Photo POS POS GPS 108

14 Hydrographic surveys Fig A sunken container discovered Upper : map showing the location of the container, Lower : bathymetric image. D m m Fig M Fig Fig Fig A discovered car Upper : bathymetric image, Lower : photograph of its salvage. m m m SeaBat PDR 109

15 Hydrographic Survey Team responding to Disasters Fig Bathymetric map of Hachinohe port. Fig Bathymetric map of Kuji port. Fig m m 110

16 Hydrographic surveys C Fig Image of a track found in Area C. Fig Survey area planned of Miyako Bay. SeaBat PDR Fig A A B C C D D E B F G G Fig Image of an obstruction considered as a yacht. D Fig Image of a caisson found in Area D. m C Fig 111

17 Hydrographic Survey Team responding to Disasters Fig Bathymetric map of Miyako Bay, based on shipborne and airborne bathymetry. Fig Bathymetric map of Kesennuma Bay. B Fig D m Fig C F A C B D Fig / Fig DGPS 112

18 Hydrographic surveys SBAS m m m H m m m m m m SeaBat PDR Fig Fig m m m m m Fig Bathymetric map of Soma port. m m PDR m m 113

19 Hydrographic Survey Team responding to Disasters m SeaBat m SeaBat Table EM SEABEAM SeaBat PDR 114

20 Hydrographic surveys m Fig Seafloor Information map of Miyako port. The red rectangle indicates the location of Fig. Fig Fig A Fig Information map of Miyako port enlarged. The location of this figure is shown in Fig. 115

21 Hydrographic Survey Team responding to Disasters Table List of seafloor information maps issued in FY. Table 116

22 Hydrographic surveys 117

Fig. 1. Active faults in the Kanto district (after Coordinating Committee for Earthquake Prediction, 1980). A-A' PROFILE DOUGUER ANOMALY RESIDUAL ANOM

Fig. 1. Active faults in the Kanto district (after Coordinating Committee for Earthquake Prediction, 1980). A-A' PROFILE DOUGUER ANOMALY RESIDUAL ANOM Structure of the Basement and the Gravity Anomaly in the Kanto Plain -A Geophysical Study of Active Fault- Takashi TADA Crustal Dynamics Department, Geographical Survey Institute (Received Apirl 7, 1983)

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