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Caltech Seismo Lab
@CaltechSeismo
Caltech's Seismological Laboratory | a focal point and source for earthquake science, discovery, and research in Southern California for over 100 years!
Pasadena, CA
seismolab.caltech.edu
Joined January 2020
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    Caltech Seismo Lab
    @CaltechSeismo
    Feb 21, 2024
    We're excited to announce that we're expanding our presence across various platforms to bring you the latest Seismo Lab and earthquake info straight from the source! For the quickest updates and earthquake insights, make sure to follow us on: šŸ”¹ X (Live SCSN EQ Tweets):
    11K
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    Caltech Seismo Lab
    @CaltechSeismo
    Dec 23, 2022
    Happy Holidays from @CaltechSeismo. We'll be back in the New Year with more on seismology's past, present, and future!
    21K
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    Caltech Seismo Lab
    @CaltechSeismo
    Aug 12, 2024
    We felt the event really well over in the Caltech Seismo Lab since it occurred roughly 4.5miles away from Caltech. Got enough attention to get a crowd in front of the waveform displays down the hall!
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    Caltech Seismo Lab
    @CaltechSeismo
    Aug 12, 2024
    M4.4 4km SSE of #HighlandPark, CA, #SouthernCalifornia #Earthquake confirmed valid. Updated analysis coming soon @ buff.ly/4aWLh0u
    27K
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    Caltech Seismo Lab
    @CaltechSeismo
    Jan 1, 2022
    Today is the #RoseParade! Floats and marching bands send seismic waves into the Earth. Seismologists use the vibrations to calibrate a seismic network made up of fiber optic cables below Pasadena, California. The paper describing this can be found here: seismosoc.org/news/fiber-optā€¦
    Figure from Wang et al. - Seismic records showing vibrations (10.0- 50.0 Hz) caused by motorcycles, floats, and bands during the 2020 Rose Parade.
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    Caltech Seismo Lab
    @CaltechSeismo
    Oct 20, 2021
    The Seismo Lab at Caltech is now active on Twitter! Follow us to learn about earthquake science, geology research and discovery, and the behind-the-scenes of the Seismo Lab. Learn more about what we do on our website: seismolab.caltech.edu
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    Caltech Seismo Lab
    @CaltechSeismo
    Aug 7, 2024
    Our Live DAS feed clearly captured the M5.2 near Lamont and numerous aftershocks. The Bold red/yellow and green horizontal lines represent the strain recorded on the equipment from land deformation along the fiber optic cable's length, which in this case is interpreted as an EQ.
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    Caltech Seismo Lab
    @CaltechSeismo
    Aug 12, 2024
    Make sure if you Felt the M4.4 near #HighlandPark that you fill out the USGS "Did You Feel It" form! Your input helps inform the scientists on perceived shaking and intensity! earthquake.usgs.gov/earthquakes/evā€¦
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    Caltech Seismo Lab
    @CaltechSeismo
    Feb 9, 2023
    On this day, 1971 San Fernando #earthquake occurred. The collapse of VA hospital was a large source of loss of life and led to new laws that restrict new buildings along active faults and formation of CSMIP @CalConservation scedc.caltech.edu/earthquake/sanā€¦
    picture is from wikipedia - By USGS (Mehmet Ƈelebi and Robert Page) - [1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=25828929
    33K
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    Caltech Seismo Lab
    @CaltechSeismo
    Mar 14, 2022
    Celebrating #womeningeoscience: in the 1950s pioneering seismologist Inge Lehmann visited the Seismo Lab. While here she made observations of the mantle's 'Lehmann discontinuity', though she is most famous for discovering Earthā€™s solid inner core in 1936! honors.agu.org/inge-lehmann-1ā€¦
    Portrait of Inge Lehmann in black and white, wearing a small hat and fur coat, her signature on the bottom right.
    Figure 1. The seismological discovery of the earth's inner core from Inge Lehmann showing paths through the earth's inner and outer cores.
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    Caltech Seismo Lab
    @CaltechSeismo
    Mar 29, 2022
    Our #womeningeoscience celebration continues with @DrLucyJones! From 1983-2016 with @USGS in the Seismo Lab, she was the first woman to colead the #SCSN in 1987, first woman to lead the USGS SoCal office, @MayorOfLA's seismic advisor in 2014 and authored 100+ EQ research papers.
    Dr. Lucy Jones in the USGS Caltech newsroom speaking into a microphone
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    Caltech Seismo Lab
    @CaltechSeismo
    May 3, 2023
    The Imperial Valley has had many swarms similar to the recent Heber and Niland swarms. A recent article by Prof. Egill Hauksson and coauthors cataloged many swarms that occurred in the northern part of the Valley, which includes the Salton Sea where this Niland swarm occurred.
    The Salton Sea geothermal area sequence (60 events) is shallow (less than 5 km) and has a b-value of 0.6, which is low for the region. The Heber sequence (169 events) is in the depth range of 4 to 10 km. It has an average b-value of 0.8. Both sequences have almost decayed to background. If there is new activity, it would be the start of a new sequence.
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    Caltech Seismo Lab
    @CaltechSeismo
    Feb 12, 2024
    The #ElCentro area has had a number of felt events this morning starting at 12:36 am PST. This sequence, likely considered a swarm, as of now, has had 2 M4+ events, 15 M3+ events, and 49 M2+ events, and numerous smaller. Our analysts are hard at work analyzing the events!
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    Caltech Quake Bot
    @CaltechQuake
    Feb 12, 2024
    M4.8 3km sequence NNW of #ElCentro, CA, #SouthernCalifornia #Earthquake confirmed valid. Updated analysis coming soon @ scsn.org/index.php/eartā€¦
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    Caltech Seismo Lab
    @CaltechSeismo
    Jul 4, 2022
    This week in #EarthquakeHistory: The 2019 Ridgecrest sequence began with a M6.4 on July 4 and a M7.1 on July 5 as the largest events. #SCSN has analyzed the 1000+ events >M3 in the sequence. Analysis on the thousands of M2 #aftershocks is still ongoing! scsn.org/index.php/2019ā€¦
    Google Earth Map of the Ridgecrest sequence. Red dots indicate earthquakes.
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    Caltech Seismo Lab
    @CaltechSeismo
    Oct 4, 2022
    This week in #EarthquakeHistory: 35 years ago the Whittier Narrows M5.9 EQ occurred. The most severe damage was in Whittier's Uptown district, Alhambra's old downtown, and Pasadena's Old Town section due to high amounts of unreinforced masonry buildings. scedc.caltech.edu/earthquake/whiā€¦
    Damage from the 1987 Whittier Narrows quake. Attribution for photo: By Whittier Museum - https://www.whittierdailynews.com/2017/09/27/photos-the-1987-whittier-narrows-earthquake-a-look-back-on-30th-anniversary/, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=112598588