September 19, 2021

Diablo Canyon Nuclear Power Plant Earthquake Safety

“After the serious amount of damage caused to the Fukushima Dai-ichi nuclear power plant in Japan opened the world’s eyes to the serious threat that nuclear power can have on our safety, professionals in the United States have turned their attention towards the Diablo Canyon nuclear plant in California.

Located near the beautiful town of San Luis Obispo, the plant was built over forty years ago by PG&E. Two fault lines, the Hosgri and Shoreline, sit dangerously close to the aged plant, creating a potentially serious issue in the event of a quake. Referred to as a “”Hot potato issue”" by U.S. Geological Survey scientist Sam Johnson, U.S. Seismologists and government officials are beginning to speculate whether the two fault lines could cause an earthquake strong enough to harm the plant and endanger nearby residents and college students.

PG&E’s previous assessment of the fault lines claims that the length of the faults is too short to cause any serious damage, but various officials have begun releasing calculations that could put the faults at over double the length they were previously recorded. Thought to only reach a length of 105 miles, the new scenario presented at the USGS headquarters in Menlo Park by Sam Johnson claims that the Hosgri fault might stretch over 250 miles all the way to Bolinas, a town just north of San Francisco.

If these calculations were to be correct, the fault lines would have the potential to generate an 8.0 earthquake, a force far too powerful for the power plant to hope to withstand. Information is being derived California Seafloor Mapping Program, but Johnson was sure to clarify that the faults have not been officially noted to run that far but the USGS.

PG&E has noted that the plant was designed and tested with quake safety in mind, but the four decades of time between it’s construction and present day leaves many to wonder just how secure the plant really is. The Shoreline fault was recently discovered in 2008, and PG&E released a 500-page report that predicted a length of only 15 miles long and a potential of a 7.5 magnitude earthquake.

Some predictions have been established that both faults might be able to work in unison to create an earthquake that was too powerful for the plant to withstand, but PG&E denied the possibility of the Hosgri fault working together with the newly discovered Shoreline fault that lays only a few hundred feet from the power plant itself.”

San Francisco Chronicle

Mothers Against The Diablo Canyon Reactor

Diablo Canyon Power Plant

Fukushima, Japan, At Diablo Canyon

Japan’s Woes Shine Light On U.S. Nuke Plants Near Fault Lines

San Andreas Earthquakes Cause Colorado River Flooding

“The San Andreas Fault in Southern California is reportedly overdue for a major earthquake. Researchers at the Scripps Institution of Oceanography believe they may know why. According to researchers, in addition to ending flooding, damming projects along the Colorado River may have altered seismic activity in the area. Prior to the damming projects, weight from the floodwaters put pressure on faults in the region, helping to trigger earthquakes.

San Andreas Earthquakes Cause Colorado River Flooding

Although researchers are able to correlate past flooding with major earthquakes in the region as far back as the 10th century, they cannot pinpoint whether the lack of flooding is delaying the area’s next major earthquake.”

More information:

Miami Herald

Wikipedia Article on the San Andreas Fault

California Tsunami Warning

Much of California is on alert under a Tsunami Warning from the NOAA Pacific Tsunami Warning Center following the 8.9 magnitude earthquake in Japan, and resulting tsunami that has already caused significant devastation and loss of life.

Additional areas are also under a tsunami warning:

  • California
  • Oregon
  • Washington State
  • as well as much of the west coasts of Mexico, Central America, and South America.
California Tsunami Warning Map

This map shows tsunami wave travel times. Much of the west coast of the United States, including California, Oregon, and Washington State are under a tsunami warning. Also, much of west coast of Mexico, Central America and South America are under a tsunami watch as well.

For a detailed list of areas under tsunami warning, click here:

Japanese Earthquake and Tsunami Person Finder

Google has set up a Japanese Earthquake Person Finder to help coordinate efforts to locate and identify people who have been affected by the devastation of the earthquake and resulting tsunami in Japan.

Japan Earthquake Person Finder

Screenshot of the Google Japan Earthquake Person Finder

Here is the link:  Japan Earthquake Person Finder

If you are looking for someone who you think has been affected by the earthquake in Japan, be sure to check into this resource.

For more information on how to prepare for an earthquake, read about how to make an earthquake survival kit.


In Japanese:




地震の準備をする方法の詳細については、読んだ どのように地震のサバイバルキットを作成する