mid-Michigan, it was 4ish, down near Gaylesburg
which is near Kalamazoo (SW side of the state).
this area is fairly stable, so it's not something
that happens often.
first one i've noticed, i know there have been
a few smaller ones before that i wasn't sure i
felt, but this one definitely shook the house
for about 5 seconds. no damage...
not like the ones you get out there all the
Saw your post and saw it noted on internet:
Brother in law in Cleveland said he did not feel it or know anything
I remember one here in Delaware over 40 years ago.
I was woken up by what I thought was a big truck rumbling down the
street. Found out the next day, it was an earthquake.
supposedly some folks felt in Toledo, and far enough
up north that i would guess that someone may have
felt it in Cleveland too, but perhaps he was doing
something that distracted him or masked it...
at 4.2 they are saying it is the second strongest
on record for MI.
no noise with this one today, just shaking the house
for a bit. i laughed and Ma said "What was that!?"
usually when the house shakes it is because someone
has gone in the ditch at the corner.
if a big one hits MI it will be interesting
because i don't think the buildings are built with
earthquakes in mind.
We almost never get them here, a couple of tiny shakes in 50 years except
for the one at Newcastle in '89, only a 5.6 but did much damage as the place
was never built for it.
However my house shakes twice a week due to the nearby coal mine blasting.
We had some guests from Japan right after the big one there in 2011. We
forgot to tell them about the blasting. Mea Culpa! The were in a panic.
Much grovelling ensued.
In the past 24 hours, there were 12 earthquakes around the world with
magnitudes greater than 4.2. Depending on the depth of the actual event
and the local geology, however, 4.2 can be a very serious quake.
Living in southern California all my life, I recall 3 very significant
* On 21 July 1952 shortly before 4:00am local time, a 7.3 quake hit near
Tehachapi in the Central Vally and killed 12 people. In Los Angeles,
the shaking damaged a major electrical substation less than a mile from
our house (about 115 miles from the epicenter). My mother said she saw
the flashes as the transformers shorted. We were without electricity
for several hours. Over a period of two months, 188 aftershocks had
magnitudes of greater than 4.0. Property damage estimates were about
* On 9 February 1971 at about 6:00am, a 6.6 quake hit Sylmar in the
north end of the city of Los Angeles and killed 65. My house (about 20
miles from the epicenter) suffered minor hairline cracks around windows.
My son's bedroom was a mess because a large coffee can filled with
crayons fell off his bookcase and spilled over his floor. We did not
lose electricity, but water service was questionable because the dams
for two major reservoirs within the city of Los Angeles began to fail.
Two hospitals were destroyed, including one that tipped over. Parts of
the freeway system collapsed. In the Angeles National Forest just north
of Sylmar, the center stripe on a road was offset several feet.
Property damage estimates were about $505,000,000.
Interestingly, this earthquake occurred very close to the time of a
spectacular lunar eclipse. Not only were the sun, earth, and moon in a
straight line; but also the moon in its elliptical orbit was at its
closest point to the earth. Furthermore the earth was just a month from
its closest to the sun. A geophysicist at the California Institute of
Technology (CalTech) agreed with my speculation that this quake might
have been triggered by the tidal stresses caused by the sun and moon.
No, they did not cause the quake; but they might have been the trigger.
* On 17 January 1994 at about 4:30am, a 6.7 quake hit Northridge in the
north-western end of the city of Los Angeles and killed 57. Repairs to
the structure of my house (about 20 miles from the epicenter) cost over
$70,000, and we had to move to an apartment while most of the repairs
were underway. We were without electricity for most of a day. Freeways
collapsed. Property damage estimates range from $13,000,000,000 to more
than $20,000,000,000 (yes, billions of dollars) and nearly bankrupted
several insurance companies that had issued insurance against earthquake
Interestingly, all three quakes occurred at night, waking us from our
David E. Ross
Climate: California Mediterranean, see
no damage reported other than a few broken windows
did they actually give way?
i was young enough that i don't recall this one,
but the others i've some recall of them.
i would believe it. when you think about how the tidal
forces can attract the water and how heavy water is that
it surely does place some stresses on the earth.
another interesting tidbit of how things can go on the
earth, there's so much ice in the south pole that it
attracts the water from the surrounding oceans.
that would certainly be no fun, i'm glad you weren't
i don't think i'd like that sort of wake up call...
I am not sure about the Pacoima reservoir because all of the attention
was focused on the lower Van Norman reservoir. If the dam at the lower
Van Norman reservoir had actually failed, a large part of the central
San Fernando Valley of Los Angeles would have been destroyed, affecting
an area of almost 1,000,000 residents. Both the upper and lower Van
Norman reservoirs were quickly but carefully drained. A few years
later, a smaller, single Van Norman reservoir was created with a dam
that is more earthquake resistant.
My conjecture -- supported by the geophysicist (for whom I provided
computer programming services at UCLA in the 1960s) -- was that the
tidal stresses were not in the ocean but in the crust of the earth. A
tidal bulge in the crust is known to exist. That bulge is raised by the
moon's gravity. The bulge is increased when there is a solar or lunar
eclipse, as the sun adds to the pull of the moon; it is also increased
when the moon is closest to the earth and when the earth is closest to
the sun, both the moon and earth having elliptical orbits.
The earth's rotation draws the bulge ahead of the earth-moon line, and
it keeps moving back towards that line but not fast enough to reach it.
The effect of this is causing a gradual slowing of the earth's
rotation. It is also causing the moon to accelerate in its orbit
around the earth and thus increasing the size of the moon's orbit,
slowly moving the moon farther from the earth.
When I was a computer programmer at UCLA, some of the software I wrote
modeled the effects the tidal bulge.
David E. Ross
Climate: California Mediterranean, see
the past few months i've been going through various
references/books about the development of the water
sources out there and how that has gone. a few notable
dam failures, can't say i'd want to be downhill from a
large reservoir out there. even if designed to withstand
an earthquake doesn't mean it actually will if a big
enough one comes along. and if a really big one does
come along, to have a dam failure on top of the damage
already done... wowie... can't believe they haven't
made a movie about this one yet...
in recent years i'm loving the river restoration efforts
where they are starting to figure out that yes indeed those
river flood plains have a real useful purpose besides being
places to collect plastic bags.
yes, for sure. i should have been clearer in my
comment in saying that if the tidal forces could move
that much water then you know it's acting on the crust
too even if it isn't so visible. with today's satellites
they can probably follow it in realtime...
the other thing that changes it is the water impoundments...
at least i recall someone writing an article about it a few
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