Jascha Polet

@CPPGeophysics

Professor of Geophysics at Cal Poly Pomona, seismologist, world traveler (or maybe that's more an ambition). Opinions are my very own.

Los Angeles, CA
Vrijeme pridruživanja: ožujak 2009.

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  1. proslijedio/la je Tweet
    2. velj

    “Frank Press, White House Science Adviser, Is Dead at 95” via | “Cooperation among scientific communities in all countries will become even more important in the years ahead as the problems we face increasingly will transcend national boundaries”

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  2. 1. velj

    Based on aftershock location and focal mechs, appears that these quakes may be occurring on a left-lateral, N-S trending structure

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  3. 1. velj

    Basin and Range!

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  4. 1. velj

    First experimental result

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  5. 1. velj

    Oh no, another highly seductive and impossible to resist time sink! I will just have to explore making one of these maps for my local neighborhood.

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  6. 1. velj

    M4.4 strike-slip earthquake near Tom's Place/Long Valley Caldera, relatively deep (at least in terms of moment tensor solution based on waveform inversion: 21 km)

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  7. proslijedio/la je Tweet
    31. sij

    The probable magma intrusion at 3-9 km depth beneath Mount in has resulted in the surface rising just over 4 cm in 10 days. Expert information at NO eruption anticipated.

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  8. proslijedio/la je Tweet
    31. sij

    After big earthquakes, long-period surface waves keep circling the globe for DAYS. Here's a continuous wavelet transform of two days of data from GSN station IU.ANMO following Tuesday's M7.7 in the Caribbean.

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  9. proslijedio/la je Tweet
    29. sij

    Earth rings like a bell after a large earthquake. My favorite part of these animations is seeing the waves *come back in* to the source after traveling all the way around the world, starting about an hour and a half after the initial quake.

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  10. proslijedio/la je Tweet
    29. sij

    Also note that this rupture would fall inside the seismic gap here, the area of the fault without any earthquakes prior to this large event. This is similar to the earthquake in Turkey a few days ago.

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  11. 29. sij

    File under "what not to do during an earthquake"

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  12. 29. sij

    Also note that this rupture would fall inside the seismic gap here, the area of the fault without any earthquakes prior to this large event. This is similar to the earthquake in Turkey a few days ago.

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  13. 29. sij

    Slip model of today's M7.7 earthquake is indicating a maximum slip of over 20 meters, which is relatively high for an earthquake of this size. Also suggests mostly unilateral rupture towards the West, which agrees with the aftershock distribution.

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  14. 29. sij

    I've updated the seismicity map with aftershocks of today's M7.7 earthquake in Caribbean in purple. All are to West of mainshock epicenter & most clustered at about 200 km, suggesting rupture propagated to West & has length of ~200 km (expected for M7.7).

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    The Jamaican M7.7 is not related to the Puerto Rican quake. Triggering of another quake happens within ~3x length of the 1st fault. The PR quake was on a ~15 mile long fault, but the M7.7 was over 800 miles away. Way too far away to be related.

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  16. proslijedio/la je Tweet
    28. sij

    7.7 quake felt on 40th story Miami building

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  17. proslijedio/la je Tweet
    28. sij

    Aftershocks of magnitude 7.7 earthquake in Caribbean are west of main epicenter from USGS catalog and map. This suggests that rupture went west towards Cayman Islands. This is consistent with reports of liquefaction there.

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  18. proslijedio/la je Tweet
    28. sij

    Pretty clear Westward propagation of rupture from today's M7.7 Caribbean earthquake; at least 200 km, but I suspect FFMs will show most of moment release likely near source.

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  19. 28. sij

    And now I have a three hour global geophysics lab to teach, so no more updates on today's earthquake(s) for a while.

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  20. 28. sij

    Sea level monitoring station close to the Jamaica M7.7 quake is showing a significant signal of about +-0.6 m

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