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17 votes
Accepted

Why were the "perfectly functioning" seismometers placed by Apollo 12, 14, 15 and 16 astronauts all shut off in 1977?

From Wikipedia: The ALSEP system and instruments were controlled by commands from Earth. The stations ran from deployment until they were turned off on 30 September 1977 due primarily to budgetary ...
Uwe's user avatar
  • 49k
9 votes
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Has Mars quaked yet? Any scientific speculation when it might?

Yes. The February 2020 peer-reviewed paper The Seismicity of Mars, Nature Geoscience 13:205-212, says: We present seismometer data recorded [from March 2019] until 30 September 2019, which reveal ...
Camille Goudeseune's user avatar
8 votes

How are the most sensitive seismometers on Mars protected from the most powerful jackhammer on Mars just a few feet away?

It survived launching, entry into the Martian atmosphere and landing. I don't imagine it needs much protection from the someone hitting the ground next to it... It messes with the readings, but that ...
ANone's user avatar
  • 3,442
5 votes

Spacing for Martian Seismic Network

SHORT ANSWER: 4-station seismology network nodes should be far (1000s km) from each other. LONG ANSWER: From Planetary Decadal Survey study of Mars Geophysical Network: In order to fully reach ...
Heopps's user avatar
  • 9,061
5 votes
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Can we know where the marsquakes come from with InSight?

According to this paper by the InSIGHT seismometer ("SEIS") team (with a list of authors as long as your arm!), techniques combining data about the arrival times of various modes of seismic ...
Tom Spilker's user avatar
  • 18.3k
4 votes
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How many times were things crashed into the Moon "for science" (seismic events)?

It runs into the dozens from the Apollo missions, all of them described here. Essentially, three types of experiments were performed: Passive seismic experiments in which data were recorded from the ...
Oscar Lanzi's user avatar
  • 8,525
4 votes
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Are there diagrams, animations, or even actual photographs of the very first "underground cable" on Mars?

The scoop on the end of the robotic arm dug a scoopfull of soil. It then moved the scoop over the top of the dome, and tipped the scoop to release the soil, which trickled down the dome to the base ...
DrSheldon's user avatar
  • 48k
4 votes
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What are InSight's barometric and seismic digitization rates and frequency responses when it "listens to the wind"?

The page at the NASA Planetary Data System Planetary Atmosphere Node on the Temperature and Wind for InSight (TWINS) instrument and Pressure Sensor (PS) has a description of the instrument and data ...
astrosnapper's user avatar
  • 2,506
3 votes

Why does the SEIS require a bellows type wind cover?

The bellows are flexible, which means the cover will adjust itself to give a good seal on the uneven surface. the bellows can be easily folded up to take up minimum volume during flight, without ...
Hobbes's user avatar
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3 votes
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How was InSight's vertical seismometer (accelerometer) tested in Earth's stronger gravity?

SEIS: Insight’s Seismic Experiment for Internal Structure of Mars has a truly gobsmacking amount of information all about Insight's seismometers. Testing facilities mentioned include: Pinion Flat ...
Roger's user avatar
  • 1,867
3 votes
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How are the most sensitive seismometers on Mars protected from the most powerful jackhammer on Mars just a few feet away?

tl;dr: $\text{HP}^3$ and SEIS compliment each other, SEIS listens to $\text{HP}^3$. SEIS adds a digital filter to prevent saturation of its most sensitive instruments. "The most powerful ...
Schwern's user avatar
  • 8,016
3 votes
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Plot of the thermally-induced tilt in Martian surface during solar eclipse by Phobos? (slope of 1 atom per meter?)

The paper in question has this to say: After correcting for instrument response, these three transits all have a clear signal with an acceleration amplitude of ~$50\text{ nm/s}^{−2}$and a duration of ...
Freddie R's user avatar
  • 2,544
3 votes
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How are marsquake epicenters determined using only one seismometer?

user34174 linked an article which explains much of the techniques used: https://www.seis-insight.eu/en/public-2/martian-science/seismic-activity To not have it lost as a volatile comment, I will ...
SE - stop firing the good guys's user avatar
2 votes

Has Mars quaked yet? Any scientific speculation when it might?

From Gizmodo's Now You Can Listen to Marsquakes: After landing on Mars last year, the InSight probe deposited a sensitive seismometer called the the Seismic Experiment for Interior Structure (SEIS) ...
uhoh's user avatar
  • 149k
2 votes
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What is VBB recentering (InSight lander's Very Broad Band seismic pendulums)?

According to this paper the recentering operation seems to be adjusting the instrument's center of gravity (via the motor unit seen on the right of the animation). From the paper... To ensure the ...
BobT's user avatar
  • 1,221

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