Many people worry that the Earth is shaking more often these days\u2014but the story is more nuanced. Here\u2019s what\u2019s really driving the apparent uptick:<\/p>\n\n\n\n
Improved Detection and Reporting<\/strong> Stable Rate of Large Tectonic Quakes<\/strong> Induced Seismicity from Human Activities<\/strong> Other Anthropogenic Triggers<\/strong> Climate Change and Natural Modulations<\/strong> Bottom Line<\/strong> Many people worry that the Earth is shaking more often these days\u2014but the story is more nuanced. Here\u2019s what\u2019s really driving the apparent uptick: Improved Detection and ReportingOver the past few decades, seismic networks around the globe have grown dramatically. More sensitive instruments and a denser array of seismometers mean we now record many tiny quakes that would have gone unnoticed in the past. In fact, the USGS\u2019s ComCat catalog shows an increasing number of reported events,…<\/p>\n","protected":false},"author":2,"featured_media":728,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[416,417,414,415,413,407,410,419,412,408,409,418,411,406],"class_list":["post-1031","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-climate-change-seismicity","tag-earthquake-hazard-assessment","tag-glacial-isostatic-rebound","tag-global-earthquake-trends","tag-human-induced-earthquakes","tag-increased-earthquake-frequency","tag-induced-seismicity","tag-plate-tectonic-stability","tag-reservoir-induced-earthquakes","tag-rising-seismic-activity","tag-seismic-monitoring-improvements","tag-small-quake-detection","tag-wastewater-injection-quakes","tag-why-are-earthquakes-increasing"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t
Over the past few decades, seismic networks around the globe have grown dramatically. More sensitive instruments and a denser array of seismometers mean we now record many tiny quakes that would have gone unnoticed in the past. In fact, the USGS\u2019s ComCat catalog shows an increasing number of reported events, not because the Earth is suddenly more restless, but because our \u201cears\u201d are much better tuned than before USGS+1<\/a>.<\/p>\n\n\n\n
When it comes to major earthquakes\u2014say magnitude 7 and above\u2014the long-term record (since about 1900) averages around 15\u201316 such events per year worldwide. There\u2019s no clear upward trend in these large, plate-boundary quakes; yearly fluctuations are just part of the normal randomness of tectonic processes USGS<\/a>.<\/p>\n\n\n\n
In certain regions\u2014especially the central and eastern U.S.\u2014earthquake rates have risen sharply since about 2010. Scientific studies link the majority of this surge to deep-well wastewater injection from oil and gas operations. Pumping fluids underground increases pore pressure in faults, effectively \u201clubricating\u201d them and triggering tremors that otherwise wouldn\u2019t occur Wikipedia+1<\/a>.<\/p>\n\n\n\n
Beyond wastewater disposal, a variety of industrial and engineering activities can induce quakes. Large reservoirs alter stress on underlying faults when they\u2019re filled or drained; heavy groundwater extraction likewise shifts crustal loads; and even geothermal energy projects can produce seismic events. While most are small, they add to regional seismicity and public concern Wikipedia<\/a>.<\/p>\n\n\n\n
Earth\u2019s changing climate can subtly modulate seismic activity too. Rapid glacier melt reduces pressure on fault zones, potentially triggering minor tremors in formerly glaciated mountains. Isostatic rebound (the slow \u201cbounce-back\u201d of Earth\u2019s crust after ice melts) also alters stress fields, and intense rainfall or rapid snowmelt can lubricate shallow faults. These effects tend to produce low-magnitude events, but they can give the impression of a more \u201cseismic\u201d planet Scientific American<\/a>seismo.ethz.ch<\/a>.<\/p>\n\n\n\n
Most of the world\u2019s shaking still comes from plate-tectonic forces that haven\u2019t changed their behavior, but our improved detection, plus localized human and climate-driven triggers, make it look like earthquakes are on the rise. Understanding these drivers helps scientists refine hazard assessments and guide safety measures, so we\u2019re better prepared no matter what kind of quake strikes.<\/p>\n","protected":false},"excerpt":{"rendered":"