Recent comments in /f/askscience
WhiteRabbitWithGlove t1_j7p92ih wrote
Reply to comment by WanderlustLife4Ever in Are people with autoimmune diseases less likely to get viral infections? How about cancers? by Selfeducated
Or a Hashimoto's favorite - insulin resistance. Once your body starts to hate you, it will hate you in many different ways.
Toorelad OP t1_j7p8xun wrote
Reply to comment by h3rbi74 in Are nocturnal animals active for longer periods in the winter? by Toorelad
Very interesting! Thank you.
GeriatricHydralisk t1_j7p82qz wrote
Reply to comment by steeltowndude in Why aren't anabolic steroids/HGH prescribed for patients recovering from wounds/grafts? Wouldn't the steroids speed up recovery time? by TPMJB
Tendons heal and remodel slowly simply because they're mostly collagen with very few cells, compared to muscle (almost all cells) and bone (which has a surprisingly high number of cells). Even with every cell working flat-out to fix/alter the tendon, there's just soooo much collagen and so few cells that it takes forever.
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CrustalTrudger t1_j7p4jnd wrote
Reply to comment by doucheluftwaffle in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
> and deduce that every X amount of years the Cascadia Subduction Zone ruptures with some regularity.
I guess this depends on your definition of "regular." If you look a the intervals between events reconstructed from the turbidite record (Table 12 on page 115 of Goldfinger et al., 2012), you'll see that these aren't exactly evenly spaced. E.g., the spacing in years between events is 232, 316, 446, 311, 982, 492, 415, 665, 661, 1189, 508, 715, 443, 548, 733, 195, 117, 577. From this you can calculate an average and it tells you that generally you'd expect an event every few hundred years, but after a given event, there's not necessarily anything to indicate whether the next one is going to be in ~100 years or ~1000 years. I would not describe that as having a particularly "regular" pattern of strain release.
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Reply to comment by CrustalTrudger in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
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[deleted] t1_j7p15vd wrote
Reply to comment by Bayoris in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
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doucheluftwaffle t1_j7ozgpr wrote
OP- the small little quakes that we have in the PNW don’t occur on/in the cascadia subduction zone.
The little earthquakes that we have are a result of us being pushed north by the San Andreas Fault. Assuming you’re in WA state, the further north you go towards Bellingham, the geology up there is mostly granite. So when we’re pushed northward, there’s no where for us to go except into the granite and lala you get the occasional low magnitude earthquake.
On land are major faults are strike slip and thrust faults and not subduction. Those faults aren’t going to help relieve Cascadia nor are they foreshocks to “The Big One.” The quakes on these faults are from normal movement and occasionally they get stuck.
As for being overdue- it’s nearly impossible to predict when Cascadia will rupture. However, geologists can study the sediment layers on the coast along with the ghost forests. Look up WA coast ghost forest; it’s really fascinating. They can also look at Native American Legends along with the written records in Japan and deduce that every X amount of years the Cascadia Subduction Zone ruptures with some regularity.
Typically scientists cant say with certainty whether or not an earthquake is a foreshock. Its only after a big one can they say that the previous one was likely a foreshock. For example; in 2002 Sumatra had 7.3 quake and then in 2004 they had a 9.1. It was only after the 9.1 did they say that the 2002 7.3 was a foreshock; separated by 2 years.
If you look at the Tohoku Japan quake (Fukushima) on they had 2 foreshocks; a 7.3 on 3/9/2011 and a 6.4 on 3/10/2011. Then on 3/11/2011 they had a 9.1.
CrustalTrudger t1_j7ozeo0 wrote
Reply to comment by dankpoet in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
In short, no. Given that people have a weird fascination with 'can we use a bomb to avoid a natural disaster', the USGS has a variety of FAQs centered around these hypotheticals, here's theirs for the bomb to set off a volcano variant.
CrustalTrudger t1_j7oz7j4 wrote
Reply to comment by [deleted] in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
A "local" scale is specifically calibrated so that some measurable quantity (like the amplitude of seismic waves as measured on a seismometer) gives a somewhat repeatable estimate of earthquake size, but only for a specific area. This is because local scales, like the Richter scale, are effectively a measure of ground shaking. For a given magnitude of earthquake (in the moment magnitude sense, which is a measure of an intrinsic property of the earthquake, i.e., the seismic moment), the details of ground shaking will depend on distance/depth but also details of the rock that the seismic waves passed through between the source and the seismometer. So for the Richter scale and other local magnitude scales, if you try to transport it somewhere else, the magnitude won't be equivalent. I.e., a true Richter magnitude of X in one place won't actually be the same size earthquake of a Richter magnitude of X earthquake somewhere else. That's not a a very useful property for a scale to have.
[deleted] t1_j7oyhcv wrote
Reply to comment by CrustalTrudger in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
Thanks for the insight. But what makes a scale locally bound? What makes it non applicable in other parts when discussing seismic activities?
CrustalTrudger t1_j7oybui wrote
Reply to comment by [deleted] in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
To clarify, the media isn't using the Richter scale, the media is reporting what ever magnitude a given service (e.g., the USGS or GFZ Potsdam GEOFON, etc) reports and then calling it a "Richter" magnitude. That magnitude is typically a moment magnitude, but depending on the location and details, it might be one of several seismic magnitude scales, e.g., occasionally you'll see a body wave magnitude (mb) or a surface wave magnitude (Ms) reported for a particular earthquake. As to why calling everything a "Richter" magnitude has persisted, it's unclear. The Richter scale was the first, but it was always a local scale (i.e., it was only really calibrated to be used in one part of the world) and it hasn't effectively been used for >50 years.
[deleted] t1_j7oy8uk wrote
Reply to comment by Clid3r in Are people with autoimmune diseases less likely to get viral infections? How about cancers? by Selfeducated
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Bayoris t1_j7oy2ae wrote
Reply to comment by Blekanly in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
It says in that wiki that when the media cites the Richter scale they really are using the Moment scale.
Bax_Cadarn t1_j7oxi3j wrote
Reply to comment by dug99 in Are people with autoimmune diseases less likely to get viral infections? How about cancers? by Selfeducated
That's actually interesting. Can You present data about how steroids affect the development of cancers?
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[deleted] t1_j7otsia wrote
Reply to comment by Blekanly in Do Little Earthquakes Prevent Big Earthquakes? by cpassmore79
Huh. Didn’t know richter was outdated. Why do the news keep that when both scales are logarithmic tho? Doesn’t even help the average Joe to better understand the magnitude doesn’t it?
[deleted] t1_j7pck5r wrote
Reply to why is prevalence of dental fluorosis increasing steadily in united states since the 1940s with no sign of stopping? by tonyhyeok
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