Chile Earthquake May Have Shortened Days on Earth

Trip · 03-02-2010, 07:35 PM

Pretty crazy

Quote:

The massive 8.8 earthquake that struck Chile may have changed the entire Earth's rotation and shortened the length of days on our planet, a NASA scientist said Monday.

The quake, the seventh strongest earthquake in recorded history, hit Chile Saturday and should have shortened the length of an Earth day by 1.26 milliseconds, according to research scientist Richard Gross at NASA's Jet Propulsion Laboratory in Pasadena, Calif.

"Perhaps more impressive is how much the quake shifted Earth's axis," NASA officials said in a Monday update.

The computer model used by Gross and his colleagues to determine the effects of the Chile earthquake effect also found that it should have moved Earth's figure axis by about 3 inches (8 cm or 27 milliarcseconds).

The Earth's figure axis is not the same as its north-south axis, which it spins around once every day at a speed of about 1,000 mph (1,604 kph).

The figure axis is the axis around which the Earth's mass is balanced. It is offset from the Earth's north-south axis by about 33 feet (10 meters).

Strong earthquakes have altered Earth's days and its axis in the past. The 9.1 Sumatran earthquake in 2004, which set off a deadly tsunami, should have shortened Earth's days by 6.8 microseconds and shifted its axis by about 2.76 inches (7 cm, or 2.32 milliarcseconds).

One Earth day is about 24 hours long. Over the course of a year, the length of a day normally changes gradually by one millisecond. It increases in the winter, when the Earth rotates more slowly, and decreases in the summer, Gross has said in the past.

The Chile earthquake was much smaller than the Sumatran temblor, but its effects on the Earth are larger because of its location. Its epicenter was located in the Earth's mid-latitudes rather than near the equator like the Sumatran event.

The fault responsible for the 2010 Chile quake also slices through Earth at a steeper angle than the Sumatran quake's fault, NASA scientists said.

"This makes the Chile fault more effective in moving Earth's mass vertically and hence more effective in shifting Earth's figure axis," NASA officials said.

Gross said his findings are based on early data available on the Chile earthquake. As more information about its characteristics are revealed, his prediction of its effects will likely change.

The Chile earthquake has killed more than 700 people and caused widespread devastation in the South American country.

Several major telescopes in Chile's Atacama Desert have escaped damage, according to the European Southern Observatory managing them.

A salt-measuring NASA satellite instrument destined to be installed on an Argentinean satellite was also undamaged in the earthquake, JPL officials said.

The Aquarius instrument was in the city of Bariloche, Argentina, where it is being installed in the Satelite de Aplicaciones Cientificas (SAC-D) satellite. The satellite integration facility is about 365 miles (588 km) from the Chile quake's epicenter.

The Aquarius instrument is designed to provide monthly global maps of the ocean's salt concentration in order to track current circulation and its role in climate change.

askmrjesus · 03-02-2010, 07:37 PM

Great, now I have to change all the clocks again.

JC

Amorok · 03-02-2010, 08:02 PM

Great. It isn't as though I didn't already run short on time, now I have even less. Guess I'll just wake up earlier.

Digifox · 03-02-2010, 08:13 PM

meh...nothing compared to to when our..uh Magnetosphere switches poles.
and we all die from the solar radiation.

Captain Morgan · 03-02-2010, 10:12 PM

Quote:

Originally Posted by Digifox

meh...nothing compared to to when our..uh Magnetosphere switches poles.
and we all die from the solar radiation.

Yep. Only have another couple years before we all die. December 2012, mark it on your calendar and make sure to spend all of your money before then.

the chi · 03-02-2010, 10:34 PM

End of days. Freaky.

Adeptus_Minor · 03-02-2010, 10:39 PM

Quote:

Originally Posted by The Chi

End of days. Freaky.

Yeah... I get anxious in the evening too... you know, what to make for dinner... what's on tonight... should I ride to work or not?

Tmall · 03-02-2010, 10:43 PM

I never understood the doomsday crowd. Shut up about it. It's not like you can say, "See, told ya so.." if you're right.

askmrjesus · 03-02-2010, 10:45 PM

Quote:

Originally Posted by Tmall

I never understood the doomsday crowd. Shut up about it. It's not like you can say, "See, told ya so.." if you're right.

Ahem.

Not JC

askmrjesus · 03-02-2010, 10:46 PM

Wow.

That turned out kinda creepy.

JC

03-02-2010, 07:37 PM	#2
askmrjesus Soul Man Join Date: Nov 2008 Location: Everywhere, all the time. Moto: '0000 Custom Turbo Cross (with jet kit). Posts: 6,481	Great, now I have to change all the clocks again. JC __________________ The way things are going, they're gonna crucify me.

03-02-2010, 08:02 PM	#3
Amorok Issukangitok Join Date: Nov 2008 Location: Biloxi, MS Moto: '06 Suzuki Boulevard C50T Posts: 2,225	Great. It isn't as though I didn't already run short on time, now I have even less. Guess I'll just wake up earlier. __________________ What goes around comes around. Sometimes you get what's coming around, and sometimes you are what's coming around. You see what I mean?

03-02-2010, 08:13 PM	#4
Digifox Cl4p-Trap Join Date: Nov 2008 Location: Columbus, Ohio Moto: Your mom. Posts: 734	meh...nothing compared to to when our..uh Magnetosphere switches poles. and we all die from the solar radiation. __________________ Firm as cherries.

03-02-2010, 10:46 PM	#10
askmrjesus Soul Man Join Date: Nov 2008 Location: Everywhere, all the time. Moto: '0000 Custom Turbo Cross (with jet kit). Posts: 6,481	Wow. That turned out kinda creepy. JC __________________ The way things are going, they're gonna crucify me.

03-02-2010, 10:43 PM	#8
Tmall Aspiring Rapper Join Date: Nov 2008 Location: Halifax, NS Moto: '12 CB1000R Posts: 3,569	I never understood the doomsday crowd. Shut up about it. It's not like you can say, "See, told ya so.." if you're right.