Earthquakes risk in Hawaii

You're standing in your kitchen in Hilo when the floor rolls under your feet. The dishes rattle. It lasts five seconds. That's a typical Hawaii earthquake — small, sharp, and over before you can decide whether to duck. But not all of them are small.

Hawaii gets a level 3 out of 5 for earthquake risk on our scale. That's moderate. It's not the San Andreas fault, but it's not nothing either. The islands sit over a volcanic hotspot, and that hotspot doesn't just make lava. It makes earthquakes.

Why Hawaii looks like this

Most people think of California when they think of earthquakes. Hawaii is different. The state isn't on a plate boundary. Instead, it's smack in the middle of the Pacific Plate, over a mantle plume that built the islands from the seafloor up. That plume causes volcanic activity, and volcanic activity causes earthquakes.

The Big Island — Hawaii County — feels the most. The south flank of Kilauea is slowly sliding into the ocean, and when it lurches, you get quakes. A recent eruption in the lower East Rift Zone was accompanied by a large earthquake, and thousands of smaller ones. Puna and Ka'u are the hot spots. But Hilo and Kona feel them too.

Maui, Molokai, and Lanai have their own faults. Oahu and Kauai are quieter, but they're not immune. A deep earthquake under the islands — caused by the weight of the islands bending the ocean floor — can shake the whole state. Those are rarer, but they can be felt from Honolulu to Lihue.

The good news: most Hawaii homes are wood-frame, which flexes rather than cracks. The bad news: older single-wall homes and any unreinforced masonry can suffer. And if you're on a hillside or near a fault, shaking can be worse.

Insurance gaps people miss

Here's the thing nobody tells you at closing: your homeowners policy does not cover earthquakes. It's almost always excluded. You need a separate earthquake policy, or an endorsement, and the deductible is usually a percentage of your dwelling coverage — often 10% to 20%. So on a $400,000 home, that's $40,000 to $80,000 out of pocket before insurance kicks in. That's a big gap.

Flood insurance is separate too. Earthquake damage is not flood damage, but a tsunami triggered by an earthquake can flood your home. Standard homeowners policies don't cover flood. You need NFIP or a private flood policy. If you live near the coast in Hilo, Kailua-Kona, or Lahaina, that's worth checking.

And if you're in a hurricane zone — which is most of Hawaii — wind damage is covered by homeowners, but storm surge flooding is not. That split trips people up. After a hurricane, you might have wind damage to your roof (covered) and water damage inside (not covered). Know the difference before you need it.

One more: volcanic eruption. Some policies exclude it entirely. Others cover it as a fire peril. Read your policy or ask your agent. If you're in Puna or Ocean View, that matters.

A practical weekend plan

If you only do one thing, strap your water heater to the wall. That's the cheapest, highest-impact move you can make. A water heater that tips over can start a fire or flood your house. A $20 strap kit and an hour of your time fixes it.

Then, if you have another weekend:

• Anchor tall bookshelves and dressers to studs. Use L-brackets.
• Know where your gas shut-off valve is and keep a wrench nearby. If you smell gas after a quake, shut it off and get out.
• Practice drop, cover, and hold on. Do it with your family. It sounds silly, but muscle memory works.
• Build a go-bag with water, snacks, meds, flashlight, and a battery radio. Keep it where you can grab it.
• Call your insurance agent and ask two questions: "Do I have earthquake coverage?" and "What's my deductible?"

That's it. You don't need a bunker. You need a few hours and a little planning.

Questions we get

Does Hawaii get tsunamis from earthquakes?

Yes. Locally generated tsunamis are a real risk, especially on the Big Island and Maui. If you feel a strong earthquake near the coast, don't wait for an official warning. Move inland or to high ground immediately. The first wave can arrive in minutes.

Is earthquake insurance required for a Hawaii mortgage?

Usually not. Lenders require flood insurance in designated flood zones, but earthquake coverage is optional. That said, if you're buying in a high-risk area like Puna or South Kona, it's worth pricing out. The premium might be less than you think.

What's the difference between earthquake and volcanic risk in Hawaii?

They're connected. Volcanic activity causes many earthquakes, but you can also get quakes from the weight of the islands pressing on the ocean floor. So you don't need an eruption to have a damaging earthquake. The two risks overlap, but they're not the same.

Official maps and agencies

Want to check your specific risk? Start with these official sources:

• Hawaii Emergency Management Agency — state-level preparedness and hazard info.
• USGS Earthquake Hazards Program — real-time quake maps and research.
• Ready.gov – Earthquakes — practical checklists for before, during, and after.
• FEMA Earthquake Safety — risk management and mitigation guidance.

Hawaii's earthquake risk is real but manageable. A little prep goes a long way. And if you're buying a home, ask about the last time the house was retrofitted or bolted to its foundation. That's a good conversation to have before you sign.