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NW Seismic

Welcome to NW Seismic, a family-owned business in Portland, OR. As a company, our admittedly self-serving mission is to create a more seismically prepared Portland. In designing and implementing a retrofit plan tailored specifically to our customer’s homes, we hope to shorten the recovery time for Portland after the next Cascadia Subduction earthquake. Read More »


We offer seismic retrofitting services for residential properties in and around Portland, OR. Please call us at (503) 741-8311 to get started with scheduling an evaluation, or, click on the "FREE Quote" button to submit an evaluation request form. Get FREE Quote »

Is Your Home Safe?

The Pacific Northwest has a major earthquake in its near future, the only question is when... The New Yorker recently published this article, The Really Big One: An earthquake will destroy a sizable portion of the coastal Northwest. The question is when. Give us a call at (503) 741-8311 to find out how NW Seismic can make your home safe, or click on the "FREE Quote" button to get started with our easy online form Get FREE Quote »

Ready to Learn More?

NW Seismic, in collaboration with OPB & Multnomah County Library, now offers Seismic Retrofitting classes at Multnomah County Library locations in and around Portland, OR. Visit our classes page to signup and reserve your spot today! Space is limited and is first come, first served. Info & Registration »

Call Today: (503) 741-8311

NW Seismic Services

NW Seismic provides the following services: Commercial and residential seismic retrofits, Foundation repair / replacement on existing buildings, Earthquake-activated gas shutoff valves, Water heater restraining systems.

Earthquake Info

From questions like, "Are Earthquakes becoming more common?" to "What is the best way to protect my home?", our F.A.Q. has just what you need!

Protect Your Home!

If your home has not undergone a seismic retrofit to withstand a major earthquake, it is time to take action. Request a free evaluation to have NW Seismic help plan the future safety of your home.

You're Safe With Us

With over 30 years of combined experience in Seismic Retrofitting techniques, your home is in good hands with us. Since we use engineering techniques in our retrofit design, our standard is what sets us apart.

In the News

You can keep up with our blog here! Subscribe to our Newsletter & feel free to post comments & questions.

Done correctly, a seismic retrofit increases the chances of your home surviving an earthquake!




NW Seismic was started in 2009 by brothers, Michael and John Wieber. Our mission is to retrofit as many residential and commercial structures as possible so as to avoid the potential catastrophic damages that a seismic event (which is imminent and likely here in our home town of Portland, OR) could inflict. We are experts and have over 30 years of combined experience in the design & installation of our custom seismic retrofits for residential and commercial clients alike. Don’t trust the safety of your home and family to just anyone… trust an expert!

The Really Big One: An earthquake will destroy a sizable portion of the coastal Nortwest. The question is when.

The New Yorker published this article on July 20th, entitled An earthquake will destroy a sizable portion of the coastal Northwest. The question is when.

Excerpt: When the 2011 earthquake and tsunami struck Tohoku, Japan, Chris Goldfinger was two hundred miles away, in the city of Kashiwa, at an international meeting on seismology. As the shaking started, everyone in the room began to laugh. Earthquakes are common in Japan—that one was the third of the week—and the participants were, after all, at a seismology conference. Then everyone in the room checked the time. Read More »

Welcome to NW Seismic!

Seismic retrofitting, or earthquake retrofitting, is technical work and involves more than just foundation bolting. Seismic retrofitting, depending on the type of building construction, involves foundation anchors (or foundation bolts), shear panels, and framing connectors, which must all be installed to specific engineered standards in order to achieve the desired result.