October 31st, 2007

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The next Big One... Primed to go?!

After the 5.6 earthquake along the Calaveras Fault last night, Bay Area seismologists will investigating whether this most recent quake could increase pressure upon the far more dangerous Hayward Fault, which runs parallel and to the northwest of the Calaveras Fault, about five miles to the NNE. It stretches along the East Bay from Fremont, Hayward, and the foothills east of Oakland, up to El Cerrito.

An article from earlier this month, 'Hayward Fault is our deadliest - a 'tectonic time bomb' , makes it clear that the Hayward Fault has a major earthquake of approximately 7.0 every 140 years, and that the last major quake hit that area in 1868.... 139 years ago.

From that article:

"A magnitude 7 quake on the fault today would likely leave about 100,000 people homeless and cause more than $1 trillion in damage, according to the Association of Bay Area Governments and the U.S. Geological Survey."

I believe that might actually be an understatement, given that a similar quote was used in this article:
"With the number of densely built cities now straddling the dangerous fault, analysts at the Association of Bay Area Governments anticipate there would be 1,100 road closures and 94,000 destroyed homes and apartment units from a magnitude 6.7 quake."

Geologists believe that the fault is capable of producing quakes as large as a magnitude 7.3, meaning that the number of deaths, injuries and damaged homes could be bigger than the area has ever planned for.

The last major earthquake hit the southern end of the Hayward Fault and toppled buildings as far away as San Francisco, primarily effecting those areas built on landfill east of Montgomery Street, with greater damage in areas like Hayward, Fremont, and San Leandro. In Hayward, then a town with about 500 residents, almost every building was damaged extensively or wrecked. Damage was reported even as far south as Gilroy and as far west as Santa Cruz.

Sadly, many of the engineering lessons learned from this earthquake and openly discussed at the time, such as the hazards of building on "made ground" reclaimed from the San Francisco Bay or the admonition to "build no more cornices," were long forgotten by the time of the 1906 quake.

Here's a USGS intensity map based on the last such earthquake on the Hayward Fault. Note that landfill area all the way up the Peninsula would be prone to heavy damage, including parts of San Francisco, SFO Airport, Foster City, East Palo Alto, and numerous major corporations which have built their headquarters and offices on marsh landfill, to the east of 101. The good news -- if you can call it that -- is that Oakland came through surprisingly well in the 1868 earthquake, due to its geography. Coastal Oakland and Alameda, however, could also expect heavy damage. 

It should be noted that earthquakes in the San Francisco Bay Area have been, historically speaking, quite moderate since the 1906 earthquake, which was approximately a 7.8. That earthquake was so powerful that it apparently relieved pressure amongst all the faults in the region. However, regional seismicity rates from the last few decades of the 20th century suggest that the San Francisco Bay Area has been emerging from this period of calm, but has not returned to the high -- yet seismologically normal -- rate of earthquakes experienced in the 1800's as yet. 
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It's good to be viscount?!

Generally speaking, I hate how the media focuses on the British royalty and on their scandals. That said, the most recent one is interesting, in large part because of what people in the British media cannot say about it.

This scandal involves a pair of blackmailers who were arrested for trying to get money out of the royals. Apparently, they have video of a royal aide snorting royally-supplied cocaine and performing oral sex on the royal member of a member of the royal family.

Well, due to British court restrictions, the British press are barred from reporting who, exactly, this royal is.

So, in the interest of circumventing censorship, I'll mention that it has been reported that the royal in question was Viscount Linley, the son of the late Princess Margaret, the Queen's younger sister.

This is the first time that a member of the British royalty has been blackmailed in over 100 years... so, if you ever happen to get ahold of video of a member of the royal family in the middle of sexual dalliances, please do the right thing and sell it to Penthouse instead. You'll make money, and it will wind up as a free download for everyone else within a week. 

Everybody wins, really.  

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Out of curiosity...

We're spending Halloween at home tonight, herding trick-or-treaters, eatin' home-toasted pumpkin seeds and a Grandpa's Cellar Apple &Caramel pie (so good!), and hopefully playing games of horror (Betrayal at House on the Hill, Arkham Horror, Munchkin Bites).

If anyone wants to drop by, drop me an email at insomnia @ livejournal.com and I will get back to you with all the details...