Nasa’s InSight Lander Captures Audio of First Likely ‘Quake’ on Mars(nasa.gov)

64 pointsby systemfreund7 anni fa14 comments

Nasa’s InSight Lander Captures Audio of First Likely ‘Quake’ on Mars

https://www.nasa.gov/press-release/nasa-s-insight-lander-captures-audio-of-first-likely-quake-on-mars

7 comments

tbabb7 anni fa

Sounds a bit like a rockfall to me, perhaps nearby? The slow buildup and slower subsidence of the sound intuitively fits what I would expect for a rockfall, and also we know there are rockfalls on the surface of Mars. It would be neat if that could be corroborated with surface evidence of a rockfall (I think a few have even been captured by satellite!)

Impulsive quakes on Earth have a characteristic waveform which this does not match: The arrival of a compression wave, followed by a larger shear wave. That waveform wouldn't be much different on another planet, since the shape of the waveform arises from the mechanical properties of rock. If it were not a rockfall, it would have to correspond more to a seismic tremor, which happens more slowly-- I know less about those and I am curious how this matches up.

Having multiple stations would really help to narrow down what the source of sounds like this could be.

GrumpyNl7 anni fa

There is no audio on mars, so they generated the sound.

tbabb7 anni fa

This is recorded from vibrations in rock, not in air. There is some sound in the very thin Martian atmosphere, and there is plenty of sound in the Martian crust.

nphard857 anni fa

The article states definitively that Mars does not have tectonic plates. This is news to me because hitherto I thought there is no evidence either way.

lawlessone7 anni fa

Plate Tectonics seems to require water , lots of water.

http://adsabs.harvard.edu/abs/2001AGUFM.U21A..09S

JorgeGT7 anni fa

Much like the Mars probes, the pre-2014 MATLAB color scheme is certainly an staunch survivor!

mhuffman7 anni fa

Come on, like Nasa isn't going to use the Jet color scheme ...

mirimir7 anni fa

Pedantry: "audio of first likely 'quake' on Mars" is unlikely. But "first likely audio of a 'quake' on Mars", sure.

bagels7 anni fa

Or "audio of first likey 'quake' on Mars (recorded by this sensor)"

mirimir7 anni fa

Sure. But that's not in the title.

foota7 anni fa

"In contrast, Earth’s surface is quivering constantly from seismic noise created by oceans and weather."

Fascinating, I wouldn't have thought these would be measurable on a large area's scale.

est317 anni fa

This omnipresent seismic noise is also a big challenge for building terrestrial gravitational wave detectors like LIGO. Even though the noise is "only" a bunch micrometers of movement, they had to deploy multiple levels of noise suppression to be able to measure gravitational waves: https://youtu.be/j4gE-hSQm68?t=1380

NeoBasilisk7 anni fa

Interesting, I didn't know that quakes could still occur without tectonic activity. The explanation makes sense, but I had just never thought about it.

rglover7 anni fa

Marsquake.