Seismic Upgrades (05:40)Ĭonstruction crews have reinforced only two Vancouver bridges due to budget constraints most will collapse in a subduction zone earthquake. Vancouver fire departments practice setting up an above ground hydrant system volunteers learn heavy urban rescue techniques. Emergency planners and responders have begun training for rescue efforts. Geologist Robert Horner tracks seismic activity on Vancouver Island. Preparing for a Subduction Zone Quake (03:54) Business owner Fusoshi Takara constructed a temporary home while awaiting relocation. However, thousands remain homeless as the city struggles to finance reconstruction. In general, structures that had been built to modern earthquake codes withstood tremors and liquefaction. Many of the collapsed structures had not been seismically retrofitted. On January 12, 1995, a 7.2 earthquake occurred close to the city, causing major damage and thousands of deaths.
The Japanese city was unprepared for a major seismic event. Subduction earthquakes are impossible to predict, but scientists use satellites and triangulation to determine ground displacement and forecast ground release. Trunk cross sections show a cedar forest died in 1700-proving a mega-thrust earthquake occurred in the Pacific Northwest. Scientists narrow its origin to a Cascadia Subduction Zone earthquake on January 26. An orphan tsunami destroyed a shogun's rice warehouse and flooded his castle on January 28, 1700. Tanabe keeps an emergency supply of rice. Earthquake and Tsunami Preparedness (03:40) A stone delineates a 1946 quake and tsunami high-water mark in Tanabe. In 1700, a tsunami of unknown origin damaged several villages.
Japan has kept records of earthquakes and tidal waves for centuries. They count tree rings and use radio carbon dating to narrow the date to the 1690s. Scientists find similar evidence along rivers in Washington. Ghost Forests (02:40)Ī subduction earthquake lowered the Vancouver forest floor, resulting in ocean flooding that killed cedar trees. Scientists find several layers of similar sediment at Pachena Bay, supporting Huu-ay-aht stories of a historic subduction earthquake. Sediment collected from the tidal wave at Port Alberni after the 1964 Anchorage Earthquake. Hear why and how mega-thrust subduction earthquakes occur. The active volcano chain extending from California to Vancouver corresponds with a tectonic plate diving off the coast. Huu-ay-aht Chief Robert Dennis tells of a historic seismic event and tsunami that destroyed his ancestral village. Recorded history only began with European settlers around 1700. Canadian emergency planners estimate thousands of deaths and billions in damages. Scientists journeyed south along the Pacific coast looking for evidence of a subduction earthquake to convince Portland, Seattle, Vancouver and Victoria that it will reoccur. Scientists had to convince Vancouver and Seattle that a similar event will occur in the future, affecting their cities. See footage of the 1964 Anchorage earthquake.
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Evidence of a Historic Natural Disaster (03:36) FREE PREVIEWĭead cedar trunks show a subduction earthquake occurred along the Pacific Northwest coast.
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