3.11 East Japan Earthquake and Topics related to Land management. Masaru Kaidzu Ibaraki-ken EX-JICA Expert Association

Transcription

1 3.11 East Japan Earthquake and Topics related to Land management Masaru Kaidzu Ibaraki-ken EX-JICA Expert Association

2 The 2011 off the Pacific coast of Tohoku Earthquake Date-Time: March 11, :46 JST March 11, :46 UTC Hypocentral Location: N, E Depth:24 km (JMA, as of ) N, E Depth:22.4 km (USGS, as of ) Moment Magnitude 9.0 (JMA, as of ) 9.0 (USGS, as of )

3 Reported damage as of October 18 th ( After Prime Minister and his Cabinet) Human casualties Found dead 15,824 Missing 3,824 Wounded 5,942 Damaged building totally destroyed 118,660 half destroyed 182,415 partially destroyed 603,193

4 Supporting victims Displaced persons 71,578 Available shelter Temporary shelter Being built 52,129 ( Completed 51,492) To be built 643 Public houses and housing for government workers Available 61,292 ( Provided 16,488)

5 Assistance from abroad 163 countries, areas and 43 organizations offered assistance 28 countries, areas and organizations dispatched rescue teams Received aid supply from 62 countries, areas and organizations Received contribution in remittance from 92 countries, areas and organizations

6 Seismographic record, crustal deformation and Tsunami record

7 Ishinomaki N-S Acceleration Examples of seismogram (After National Research Institute for Earth Science and Disaster Prevention ) Displacement Rikuzentakada N-S Acceleration Displacement

8 Displacement at Mito City

9 Crustal deformation and estimated distribution of slip on the plate boundary Slip model after GSI and JCG Moment magnitude =9.0 Maximum displacement =54m Horizontal and Vertical co-seismic displacement observed with GPS by GSI(on land) and JCG (on seabed)

10 ITRF reference stations

11 Displacement of Tsukuba VLBI station After GSI

12 Post-seismic slip After GSI

13 Displacement due to after effect After GSI

14 Geonet (Continuous GPS observation) Geospatial Information Authority of Japan (GSI) has released on May 31 New coordinate for new epoch and parameters for semi-dynamic correction

15 Geodetic control stations GSI has carried out resurvey of geodetic control stations in northern Japan New coordinates are released at the end of October, 2011 Ministry of Justice (MOJ) issued an official notice on March 18 that coordinates are to be temporally treated as local coordinates and at the same time, if surveyors can use control stations, note that so that later they can give official coordinates when GSI revised coordinates MOJ announced that people should be careful to date on map or certificate of map because those coordinates on such documents or maps will be corrected after GSI finishes their revision of coordinates of control stations.

16 Schematic model of crustal deformation and generation of Tsunami

17 Tsunami

18 Tide gauge record after Japan Coast Guard At Kamaishi: Scale out and broken 2 nd wave was the largest

19 Before the Earthquake after the Earthquake after NASA

20 Rikuzentakada from east

21 Challenges Most of buildings are lost Large horizontal displacement Streets and paths can be recognized

22 Rikuzenntakada from NW

23 Inside block are not well remained As streets are visible, if cadastral record is there, we can recover boundaries If modern cadastral survey was not yet finished, we may face a problem in finding boundary According to law, boundaries can not be created but found < In 1873, boundaries have been already officially set

24 Liquefaction Jetted sand After Urayasu City Lateral flow

25 Cadastre and Registration

26 Request of preservation of boundary marks by MOJ Just after the earthquake (March 24), MOJ issued press release asking people preserve boundary marks. The announcement was with picture of a real mark so that any one will recognize how it looks like.

27 Official notices issued by MOJ On March 24: Preservation of boundary monument in restoration work On March 29: When land certificate is lost by East Japan earthquake or tsunami On April 14: Treatment of request for preventing unjust registration of land

28 Guidance for surveyors and municipalities by MLIT On March 24: Administrative circular of assistant chief of division showing a guide line for immediate measure in carrying out cadastral survey on going at that time Followed by Q/A

29 Threat of power failure and counter measure Mainly due to tsunami, some of nuclear power plants stopped It caused insufficient power supply in wide area Eastern Japan and metropolitan area was in power alert (by virtue of power saving movement, actually no power failure occurred other than directly damaged area) Processing survey data need electric power => Some companies processed their data in safe area like Hokkaido

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31 Land price: MLIT s Press release On August,1: MLIT issue press release stating that it will watch land price together with prefectural government According to National Land Use Planning Act, government can set area under land price surveillance when unusual rise in land price is a concern This action is to prevent unusual rise of land price due to people s preference in high lands

32 Measure taken by Head quarter for rehabilitation Creating special rehabilitation zone, Delivery of flexibly usable grant, Application of PPP, PFI and so on, Secure about 13 trilion yen for above measure, Action for rehabilitation such as Create new regional society corresponding to change in population structure General mobilization of hardware and software for reduction of damage Mechanism for swiftly realize reorganization of land use (including monitoring Land price and number of transactions) Assistance in human resources Rehabilitation will take 10 years and first 5 years are supposed to be period with intensified measure. Care for recovery from damage of Fukushima nuclear power plant is of course included.

33 Multifold defense against Tsunami Residential area Levee Commercial area Industrial area Agricultural area Use highway/railway embankment as 2 nd or 3 rd coastal levee High rise tsunami-shelter will be properly distributed in low land

34 Conclusion Crustal deformation caused by the earthquake is very much wide spread and large in magnitude Geodetic coordinates are to be revised by the end of October The transfer to new coordinates will smoothly be done when re-survey finishes (They are experienced) MOJ had already finished registered documents and maps digitized at the time of the earthquake and necessary data was practically bucked up

35 For future It will take long time in rehabilitation Long term plan is necessary but people must restore their daily life -> Where to compromise? Disaster resistant way of life is necessary Financial problem So much to do = we should keep our eyes on Eastern Japan -> Same for Haiti, Sumatra or other places