WTC Towers Collapse Caused Small Earthquakes

when New York's World Trade Center towers collapsed, a siesmic station recorded earthquakes of magnitude 2.1 and 2.3. This analysis examines how gravity contributed to the collapse of the towers.

1 minute read

October 5, 2001, 1:00 PM PDT

By Abhijeet Chavan @http://twitter.com/legalaidtech


"Though terrorists triggered the collapse of the World Trade Center's twin towers, much of the energy -- calculated by a physicist to have been at least 2 percent that of the atomic bomb dropped on Hiroshima -- was supplied by nature's most ubiquitous force: gravity...When the crumbling towers thudded to the ground, they created ground tremors equal to earthquakes of magnitude 2.1 and 2.3, as measured by a seismic station in Palisades, N.Y., 21 miles north of Manhattan...More surprising, even the impacts of the airliners shook the ground, registering with the equivalent of earthquakes with magnitudes of 0.7 and 0.9."

Thanks to Abhijeet Chavan

Friday, October 5, 2001 in MSNBC

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Use Code 25for25 at checkout for 25% off an annual plan!

Redlining map of Oakland and Berkeley.

Rethinking Redlining

For decades we have blamed 100-year-old maps for the patterns of spatial racial inequity that persist in American cities today. An esteemed researcher says: we’ve got it all wrong.

May 15, 2025 - Alan Mallach

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

May 14, 2025 - Diana Ionescu

Front of Walmart store with sign.

Walmart Announces Nationwide EV Charging Network

The company plans to install electric car chargers at most of its stores by 2030.

May 7, 2025 - Inc.

Aerial view of Albuquerque, New Mexico at sunset.

New State Study Suggests Homelessness Far Undercounted in New Mexico

An analysis of hospital visit records provided a more accurate count than the annual point-in-time count used by most agencies.

May 16 - Source NM

Close-up on white bike helmet lying on pavement with blurred red bike on its side in background abd black car visible behind it.

Michigan Bills Would Stiffen Penalties for Deadly Crashes

Proposed state legislation would close a ‘legal gap’ that lets drivers who kill get away with few repercussions.

May 16 - Wood TV 8

Muni bus on red painted bus-only lane in downtown San Francisco, California.

Report: Bus Ridership Back to 86 Percent of Pre-Covid Levels

Transit ridership around the country was up by 85 percent in all modes in 2024.

May 16 - Mass Transit