Seismologist in Southern California. Viol player. Founder of Tempo: Music for Climate Actionhttps://bsky.app/profile/drlucyjones.bsky.socialhttps://bsky.app/profile/drlucyjones.bsky.social/post/3mlhw6yclss2kThe Imperial Valley has seen dozens if not hundreds of these sort of swarms over the century we have recorded. A swarm is a group of quakes (dozens to thousands) where there are many quakes close in size and no obvious mainshock. Often the size will grow like we've seen here going from M3s to M4s.10 May 2026 04:26 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mlhw6yclss2khttps://bsky.app/profile/drlucyjones.bsky.social/post/3mlhvmo6rc22kThe Brawley swarm is continuing and getting a bit bigger. It began with a M3.5 at 4:14 pm. After 4 M3s, it gave us a M4.4 at 7:22. Then a couple more larger events M4.0 and M4.5. There is no sign of a drop off in number of events, so we shouldn't be surprised if we see at least a few more M3s. https://scedc.caltech.edu/recent/Maps/116-33.html10 May 2026 04:16 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mlhvmo6rc22khttps://bsky.app/profile/drlucyjones.bsky.social/post/3mlhpyrpqc22vSo 2 areas with swarms ongoing in Southern California. A classic Brawley seismic zone swarm today in the Imperial Valley fault. Largest so far is M4.1. These continue until they stop so we will likely see more M3s tonight and may get bigger.10 May 2026 02:35 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mlhpyrpqc22vhttps://bsky.app/profile/drlucyjones.bsky.social/post/3mijr4lstfs2oWe have an exciting event coming up to bring music and science together- a collaboration between Colburn School and Caltech. April 25. In The Name of a Warming Earth' - Dr. Lucy Jones https://localnewspasadena.com/2026/in-the-name-of-a-warming-earth-dr-lucy-jones/02 Apr 2026 17:45 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mijr4lstfs2ohttps://bsky.app/profile/drlucyjones.bsky.social/post/3mgzwqj6e6s2vMy last anniversary is the happiest one of the week. Georg Philipp Telemann was born 345 years ago and we are celebrating with an all-Telemann concert by Los Angeles Baroque14 Mar 2026 17:18 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mgzwqj6e6s2vhttps://bsky.app/profile/drlucyjones.bsky.social/post/3mgv4s46wbk2vThe third anniversary of the week. 100 years ago today, LADWP began impounding water at the San Fransquito Dam in northern LA County. Exactly 2 years later on 3/12/1928, the dam failed suddenly and catastrophically, releasing 47million cubic meters of water, killing 430+ people.12 Mar 2026 19:23 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mgv4s46wbk2vhttps://bsky.app/profile/drlucyjones.bsky.social/post/3mgsgsdudns2wAnother anniversary. 15 years ago today, the M9.1 Tohoku earthquake and tsunami swept through northeaster Honshu, sweeping away whole towns and killing almost 18,000 people. Five years later, this town of Otsuchi was still struggling with what to allow to be rebuilt.11 Mar 2026 17:44 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mgsgsdudns2whttps://bsky.app/profile/drlucyjones.bsky.social/post/3mgpzczgc522rThe 1933 Long Beach earthquake occurred 93 years ago today, beginning near Huntington Beach and rupturing north for 15 miles to just north of Long Beach. It cause strong shaking through much of the Los Angeles region. with the worst damage in Long Beach and Compton.10 Mar 2026 18:38 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mgpzczgc522rhttps://bsky.app/profile/drlucyjones.bsky.social/post/3mct54bt3gk25Tonight's M4.9 north of Indio is the largest quake in SoCal since the M5.2 near Julian last April.20 Jan 2026 02:43 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mct54bt3gk25https://bsky.app/profile/drlucyjones.bsky.social/post/3mct4oyplvs25A M4.9 quake occurred this evening north of Indio. It is east of the San Andreas fault, far enough away to not change the likelihood of a quake on the San Andreas. It's located very near the minor EW-striking Blue Cut fault https://earthquake.usgs.gov/earthquakes/eventpage/ci41162719/executive20 Jan 2026 02:35 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mct4oyplvs25https://bsky.app/profile/drlucyjones.bsky.social/post/3mbarpprnkc2dI’m releasing a few new episodes of my podcast to discuss the science around wildfires https://podcasts.apple.com/us/podcast/getting-through-it/id152047581831 Dec 2025 02:06 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3mbarpprnkc2dhttps://bsky.app/profile/drlucyjones.bsky.social/post/3m7jnj4sixk2wAgain, Kyle and Judith provide a great summary of the science around this earthquake [contains quote post or other embedded content]09 Dec 2025 03:54 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3m7jnj4sixk2whttps://bsky.app/profile/drlucyjones.bsky.social/post/3m6y3pzll3c2pSometimes, music is the only tool I have for coping with the world. https://youtu.be/2Xj0KSgD24k?si=KDgi-ULTZi2HAGRN02 Dec 2025 04:20 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3m6y3pzll3c2phttps://bsky.app/profile/drlucyjones.bsky.social/post/3m5dcljgwdc24I love xkcd11 Nov 2025 04:32 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3m5dcljgwdc24https://bsky.app/profile/drlucyjones.bsky.social/post/3lxuk6epyo227This was a fun interview. It ended up being quite a retrospective on how seismology has changed over the 4 decades I have been in Pasadena. https://making-l-a.simplecast.com/episodes/lucy-jones-seismology-shakeouts-and-string-quartets-EHD3hkaR02 Sep 2025 16:32 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lxuk6epyo227https://bsky.app/profile/drlucyjones.bsky.social/post/3lvrd22t46s2dIn the last 24 hours, we have seen several M3s in 3 locations. The events near Ontario are at the western end of the Fontana trend. The Lytle Creek events are near the San Andreas & the Rialto events are where the Fontana trend intersects the San Andreas. Last week's M4.3 was at the Rialto location06 Aug 2025 22:56 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lvrd22t46s2dhttps://bsky.app/profile/drlucyjones.bsky.social/post/3lvhn7we6sc2hThe New York - Philadelphia - Wilmington urban corridor has felt small earthquakes roughly every 2-3 years. Moderately damaging earthquakes strike somewhere in the urban corridor roughly twice a century. So infrequent but not weird [contains quote post or other embedded content]03 Aug 2025 02:32 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lvhn7we6sc2hhttps://bsky.app/profile/drlucyjones.bsky.social/post/3lvc5iupkec2dOn the M4.3 on the Fontana trend31 Jul 2025 22:07 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lvc5iupkec2dhttps://bsky.app/profile/drlucyjones.bsky.social/post/3lvblcp4jbs2dLooks like a small swarm in the Fontana trend. This M4.2 had a few foreshcoks including a M3.0. The Fontana trend is a NE-striking lineation of earthquakes under the sediments of the San Bernardino Vslley. We believe it is one of the left-lateral striking faults that are south of the San Gabriels. [contains quote post or other embedded content]31 Jul 2025 16:41 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lvblcp4jbs2dhttps://bsky.app/profile/drlucyjones.bsky.social/post/3lv6wagerzc2iThe 7/29/2025 M8.8 looks like a repeat of an earthquake in 1952 [contains quote post or other embedded content]30 Jul 2025 15:19 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lv6wagerzc2ihttps://bsky.app/profile/drlucyjones.bsky.social/post/3lsetlfqan22tEven very small quakes can be felt if you are nearby (and a shallow quake is closer to people on the surface). But there is not much to be said about an M2.7 except that it happened https://earthquake.usgs.gov/earthquakes/eventpage/ci41002943/dyfi/intensity24 Jun 2025 19:32 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lsetlfqan22thttps://bsky.app/profile/drlucyjones.bsky.social/post/3lr2zvy4ba22tThis study uses "overdue" to mean that time time since the last quake is longer than the average time between earthquakes. But that doesn't mean the next quake is more likely in the near future. The length of intervals between events is very variable even at one location. [contains quote post or other embedded content]08 Jun 2025 04:33 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lr2zvy4ba22thttps://bsky.app/profile/drlucyjones.bsky.social/post/3lqzxb3mtu22tThis does not mean the big earthquake is more likely. Whatever is making for long intervals is happening now. [contains quote post or other embedded content]07 Jun 2025 18:13 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lqzxb3mtu22thttps://bsky.app/profile/drlucyjones.bsky.social/post/3lozlrsdjcc2bIt is so cool to see actual fault offset, but I am also struck by how small the shaking is. This is the ultimate "near-field" site, but the shaking is not enough to topple any of the tall vases. [contains quote post or other embedded content]13 May 2025 03:57 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lozlrsdjcc2bhttps://bsky.app/profile/drlucyjones.bsky.social/post/3lnjf43giwk2fI've partnered with OcTech, Caltech's choral octet, to create Courage To Care: a concert & discussion to process climate angst in a time of historic fires. If you're in SoCal, come build community with us! Sunday, April 27th, 7:30 PM Dabney Lounge on the Caltech campus Tickets: No tickets - free!23 Apr 2025 23:50 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lnjf43giwk2fhttps://bsky.app/profile/drlucyjones.bsky.social/post/3lmtcjtkiyc2hInteresting to look at the detailed relocations of the aftershocks to the M5.2. It looks like they are not on the main strand of the Elsinore fault.15 Apr 2025 05:05 +0000at://did:plc:m6ku7b5caasw5pasqr5atspt/app.bsky.feed.post/3lmtcjtkiyc2h