A hearty shake south of the border serves as a good reminder 含羞草研究社� and information-gathering tool 含羞草研究社� for coastal B.C. residents, says one seismologist who works on the Saanich Peninsula.
John Cassidy, an earthquake seismologist with National Resources Canada, tweeted images showing shaking on Vancouver Island when a 6.4 magnitude earthquake struck California Tuesday (Dec. 20).
There was no shaking felt in B.C., nor a tsunami expected after the earthquake at 2:34 a.m. near Ferndale, about 345 kilometres northwest of San Francisco, just offshore and about 16 km deep.
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含羞草研究社淚t is a really active area,含羞草研究社� Cassidy said, noting the region had a similar event, a 6.2, exactly a year ago.
The 2 a.m. quake in California was enough to frighten and cause damage to nearby communities.
Cassidy explained Greater Victoria residents get earthquakes that size off Vancouver Island, but 50 or 100 kilometres off shore 含羞草研究社� so we feel them but it含羞草研究社檚 not damaging or frightening.
But what they all are is informative.
Ground shaking on as waves from this morning's M6.4 northern earthquake rolled across the region. Shaking was felt across northern CA, southern OR and a few reports from as far away (800+ km) as Seattle and Los Angeles
含羞草研究社� John Cassidy (@earthquakeguy)
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Thousands of people reported feeling shaking, of varying degrees, across northern California, southern Oregon and even as far as Seattle. Closer to home, the seismometer in the Institute of Ocean Sciences building in North Saanich recorded the Island含羞草研究社檚 waves. The sensitive instruments are designed to detect tiny earthquakes that happen every day that no one even feels.
To study earthquakes you need data from different locations, with accurate times and accurate recordings, Cassidy said.
含羞草研究社淭here is a lot that can be learned from recordings, not just from very close to the earthquake, but 800 to 900 km from the earthquake,含羞草研究社� he said.
含羞草研究社淥ne of the things you want to learn is the fault it occurred on, how much it moved, how it moved. Looking at data from all sides and distances you can pin down what happened.含羞草研究社�
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It also serves as a timely reminder the west coast of North America is a very active earthquake zone.
含羞草研究社淚t含羞草研究社檚 a good reminder to check the earthquake kits and update the plan and know what to do when shaking begins,含羞草研究社� Cassidy said. 含羞草研究社淪ome of the world含羞草研究社檚 largest earthquakes have occurred here. But it含羞草研究社檚 been a long time and it含羞草研究社檚 easy to forget.含羞草研究社�
Black Press Media has prepared an emergency guide to help residents be ready. To learn more,
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christine.vanreeuwyk@blackpress.ca
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