Can Mariners fans cause an earthquake? Seismometer installed for Game 5

We’re going to find out if Seattle Mariners fans can get loud enough to create an earthquake.

A seismometer has been installed at T-Mobile Park ahead of Friday night’s decisive Game 5 of the American League Division Series to measure the seismic activity of an expected crowd of over 47,000 on the corner of Edgar and Dave.

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The Pacific Northwest Seismic Network shared photos on social media Friday morning of their installation of a seismometer, giving a nod to something Mariners All-Star catcher Cal Raleigh said following the team’s Game 2 win at the stadium on Sunday night.

“Cal Raleigh said he could feel the ground shaking in Game 2, so we came to take a closer look!” reads the post. “… We want to feel this place rocking!”

Happy #FieldworkFriday @Mariners fans! Cal Raleigh said he could feel the ground shaking in Game 2, so we came to take a closer look! We installed a seismometer right here in @TMobilePark to record seismic energy during game 5. We want to feel this place rocking! #SeizeTheMoment pic.twitter.com/iDG1eXVcZ8

— PNSN (@PNSN1) October 10, 2025

The device has a catchy nickname: “Richter Rizzs,” in honor of longtime Seattle Mariners radio play-by-play voice Rick Rizzs.

Richter Rizzs ready to roll 🫡 https://t.co/8NM5aoWieK pic.twitter.com/0QFy3H2JfM

— T-Mobile Park (@TMobilePark) October 10, 2025

Live monitoring of the seismometer’s readings will be available starting at 4 p.m. Friday at Mariners.PNSN.org.

Seattle sports fans have a history of seismic activity. In 2011, Seattle Seahawks running back Marshawn Lynch reeled off a 67-yard touchdown run in a playoff win over the New Orleans Saints, commonly known as “the Beast Quake,” that registered a 2.0 on the Richter Scale. A 2.0 is considered the very top of a microearthquake, according to the U.S. Geological Survey.

Mariners fans will have to get seriously loud to match that output. The Beast Quake game had an official attendance of 66,336 at Lumen Field, which has a capacity of over 20,000 more than T-Mobile Park.

Game 5 of the ALDS is set for a 5:08 p.m. first pitch. Radio coverage on the Seattle Sports app and Seattle Sports 710 AM will begin with an extended pregame at 2 p.m.

Seattle Mariners coverage

• Mariners face Tarik Skubal again in winner-take-all ALDS Game 5
• Salk: Mariners’ plan for Game 5 needs to be like there’s no tomorrow
• Kirby to start Game 5 with all hands on deck for Mariners
• Could Arozarena’s big-game pedigree emerge in Game 5?
• Hyphen’s keys for Seattle Mariners to beat ace Skubal one more time

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