{"id":5694,"date":"2026-09-14T13:43:52","date_gmt":"2026-09-14T20:43:52","guid":{"rendered":"https:\/\/tungsten2.gps.caltech.edu\/?p=5694"},"modified":"2026-09-14T14:29:07","modified_gmt":"2026-09-14T21:29:07","slug":"09-12-2026-m2-7-swarm-near-lennox","status":"publish","type":"post","link":"https:\/\/www.scsn.org\/index.php\/2026\/09\/14\/09-12-2026-m2-7-swarm-near-lennox\/","title":{"rendered":"09\/12\/2026, M2.7 swarm near Lennox"},"content":{"rendered":"<p><b>Significant Events<\/b><\/p>\n<ul>\n<li>Largest event: M2.7, 12 Sep 2026 04:32:19 PDT, (33.937, -118.303), depth 19.4km. 4km E of Lennox, California.<\/li>\n<li>As of 14 Sep 2026, 01:09PM PDT, the following event numbers have been recorded in the swarm:<\/li>\n<ul>\n<li>M&ge;2: 7<\/li>\n<\/ul>\n<li>All M2 events recorded:<\/li>\n<ul>\n<li>M 2.3 10 Sep 2026 12:40:48 PDT, (33.925, -118.323), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41544336#executive\", target=_blank>41544336<\/a><\/li>\n<li>M 2.3 11 Sep 2026 07:57:27 PDT, (33.925, -118.312), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41544784#executive\", target=_blank>41544784<\/a><\/li>\n<li>M 2.6 12 Sep 2026 00:34:56 PDT, (33.930, -118.302), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545392#executive\", target=_blank>41545392<\/a><\/li>\n<li>M 2.4 12 Sep 2026 00:35:03 PDT, (33.920, -118.345), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci10253326#executive\", target=_blank>10253326<\/a><\/li>\n<li>M 2.2 12 Sep 2026 00:38:05 PDT, (33.928, -118.308), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545408#executive\", target=_blank>41545408<\/a><\/li>\n<li>M 2.2 12 Sep 2026 02:04:42 PDT, (33.935, -118.302), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545592#executive\", target=_blank>41545592<\/a><\/li>\n<li>M 2.7 12 Sep 2026 04:32:19 PDT, (33.937, -118.303), <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545920#executive\", target=_blank>41545920<\/a><\/li>\n<\/ul>\n<\/ul>\n<p><b>Swarm Numbers<\/b><\/p>\n<ul>\n<li>As of 14 Sep 2026, 01:09PM PDT, we have recorded 116 events in the swarm (within a 20 km radius, and counting 5 days before the largest event). The smallest event is magnitude 0.5. Many of the smaller events are still being analyzed and will be gradually added to the catalogue.<\/li>\n<li>More activity is expected in the next few days, swarm activity in Southern California can continue for hours, days, weeks, months or years. For more information on swarms please see our <a href=\"https:\/\/www.scsn.org\/index.php\/earthquakes\/earthquake-swarms\/\", target=_blank>Swarm page<\/a>.<\/li>\n<\/ul>\n<p><b>Historical Seismicity<\/b><\/p>\n<ul>\n<li>Since our records began in 1932 we&#8217;ve had 26 events of M4 or greater within 10km of today&#8217;s event.<\/li>\n<li>The largest historic event was M5.1 on 1941\/11\/14.<\/li>\n<li>The most recent historic event was M4.4 on 12 Aug 2024.<\/li>\n<\/ul>\n<p><b>Faults<\/b><\/p>\n<ul>\n<li>Nearby faults: Newport-Inglewood-Rose Canyon fault zone, north Los Angeles basin section (0.8 km), Charnock fault (7.1 km) and Palos Verdes fault zone, Palos Verdes Hills section (Palos Verdes Hills fault) (15.0 km).<span>&#42;&#42;<\/span><\/li>\n<\/ul>\n<p><b>Additional Information<\/b><\/p>\n<ul>\n<li>Links for: <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545920#executive\">USGS earthquake page<\/a>, <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545920\/shakemap\/intensity\">ShakeMap<\/a>, <a href=\"https:\/\/earthquake.usgs.gov\/earthquakes\/eventpage\/ci41545920\/dyfi\/intensity\">DYFI<\/a>, <a href=\"http:\/\/pasadena.wr.usgs.gov\/eqview\/cgi-bin\/makePublicView.php?EVID=41545920\">waveforms<\/a>.<\/li>\n<li>Visit our <a href=\"https:\/\/www.scsn.org\/index.php\/earthquakes\/speqrep\/\">special reports page<\/a> for further information on local notable earthquakes.<\/li>\n<\/ul>\n<p><b>Relocated Sequence Model<\/b><br \/>\n<div class=\"scsn-html-iframe-embed\"><iframe src=\"https:\/\/www.scsn.org\/wp-content\/uploads\/html-iframe-embeds\/244ca010-b9dd-4748-844b-a69fda201d50\/index.html\" title=\"lennox 2026\" loading=\"lazy\" sandbox=\"allow-scripts allow-forms allow-popups allow-downloads\" referrerpolicy=\"strict-origin-when-cross-origin\" style=\"display:block;width:100%;height:700px;border:0;\" width=\"100%\" height=\"700\"><\/iframe><p style=\"margin:8px 0 0;text-align:right;\"><a href=\"https:\/\/www.scsn.org\/wp-content\/uploads\/html-iframe-embeds\/244ca010-b9dd-4748-844b-a69fda201d50\/index.html\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open lennox 2026 in a new tab\" style=\"display:inline-block;padding:7px 12px;border:1px solid #767676;border-radius:3px;background:#f6f7f7;color:#1d2327;text-decoration:none;font-size:14px;line-height:1.4;\">Open in a new tab<\/a><\/p><\/div><br \/>\n<span style=\"display:block; height:0.25em;\"><\/span><br \/>\n<img decoding=\"async\" src=\"https:\/\/tungsten2.gps.caltech.edu\/wp-content\/uploads\/2026Lennox_map-scaled.png\" alt=\"2026 Lennox Map\"style=\"width:100%; height:auto; align:center; display:block;\"\/><\/p>\n<p>This map, and 3d model above, shows the locations of earthquakes in the 2026 Lennox M2.7 Sequence, in Southern California. They were generated using a refined technique called HypoDD (Hypocenter Double-Difference) relocation, which determines earthquake locations by comparing pairs of nearby earthquakes recorded at the same station, rather than relying solely on the absolute travel time of waves through the Earth\u2019s crust. The result is a much more accurate picture of where the earthquakes are actually occurring. Each circle represents one earthquake, with the size scaled to its magnitude and the color indicating when it happened, letting you see how the seismicity evolved over time. The Magenta Diamond marks the largest event in this sequence so far, a M2.7. The two smaller panels along the bottom and right side show depth cross-sections, which help reveal the geometry of the fault system at depth. The map includes events from 5 days before the mainshock and is current as of 2026\/09\/14, 21:05:25UTC.\n<\/p>\n<p><small><\/p>\n<p><span>&#42;<\/span>Earthquakes can occur both near or on major known faults, and in places where no clear fault zones are known. Using the statistical method of Evans et al. (in prep. 2019) the location and focal mechanism of this earthquake suggest the above association with modeled faults in the <a href=\"https:\/\/www.scec.org\/research\/cfm\" target=\"_blank\">Community Fault Model (CFM)<\/a> provided by the Southern California Earthquake Center (SCEC) and Harvard University. Note that the CFM fault association may be different from the nearby faults list. Differences may arise due to different fault databases, and because the CFM fault association uses the hypocenter with relation to subsurface 3-dimensional fault orientation models, while the nearby faults list utilizes mapped surface traces as they relate to the epicenter.<\/p>\n<p>CFM Fault: SCEC CFM 5.0 Fault name and closest segment if available; The CFM is maintained by Harvard University, Dept of Earth &#038; Planetary Sciences.<\/p>\n<p>Probability: The probability in percent the earthquake is associated with this fault.<\/p>\n<p>SCSN: Caltech\/USGS Southern California Seismic Network<\/p>\n<p><span>&#42;&#42;<\/span>U.S. Geological Survey and California Geological Survey, 2006, Quaternary fault and fold database for the United States, accessed 2015, from USGS web site: <a href=\"https:\/\/earthquake.usgs.gov\/hazards\/qfaults\/\">https:\/\/earthquake.usgs.gov\/hazards\/qfaults\/<\/a><\/p>\n<p><\/p>\n<p>This information is subject to change as more up-to-date data become available.<\/p>\n<p><\/small><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Significant Events Largest event: M2.7, 12 Sep 2026 04:32:19 PDT, (33.937, -118.303), depth 19.4km. 4km E of Lennox, California. As of 14 Sep 2026, 01:09PM PDT, the following event numbers have been recorded in the swarm: M&ge;2: 7 All M2<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"https:\/\/www.scsn.org\/index.php\/2026\/09\/14\/09-12-2026-m2-7-swarm-near-lennox\/\">Read more &#8250;<\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[833,832,418,231],"class_list":["post-5694","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-09-12-2026","tag-832","tag-lennox","tag-m2-7"],"_links":{"self":[{"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/posts\/5694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/comments?post=5694"}],"version-history":[{"count":6,"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/posts\/5694\/revisions"}],"predecessor-version":[{"id":5701,"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/posts\/5694\/revisions\/5701"}],"wp:attachment":[{"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/media?parent=5694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/categories?post=5694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.scsn.org\/index.php\/wp-json\/wp\/v2\/tags?post=5694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}