Mt Maunganui landslide reactivates six months after fatal January slip

Six people were killed in the January landslide; the reactivation poses ongoing risk to residents and businesses in the area.
The mountain was not stable. It was in motion.
Six months after January's fatal landslide, Mount Maunganui's slope reactivated with three fresh slips in 48 hours.
Mark

Why does a landslide reactivate like this? Is it just more rain, or is something deeper broken?

Mimi

It's usually both. The January slip created a new surface—a scar in the slope. That surface is weaker than the surrounding rock and soil. When it rains heavily, water infiltrates along that weak plane, reducing friction, making the material want to slide again. But yes, something deeper is broken. The slope's internal structure has been compromised.

Mark

The council said the material is "liquefied." That's an alarming word choice.

Mimi

It's the right word. When soil becomes saturated and loses its strength, it behaves less like earth and more like a thick fluid. It flows rather than breaks. That's what makes it so unpredictable—and so dangerous. You can't predict exactly where a fluid will go.

Mark

Three slips in 48 hours, each as big as the original. How is that even possible?

Mimi

The January slip destabilized a much larger mass of material above it. Think of it as removing a keystone. Now that keystone is gone, and everything above wants to follow. Each slip removes more support for what's above, making the next slip more likely.

Mark

The monitoring equipment worked—it warned them before each slip. So why does that feel insufficient?

Mimi

Because warning is not prevention. The equipment told them a slip was coming, but it couldn't stop it. And it can't tell them when the next one will happen, or if it will be the last one. They're managing risk, not eliminating it.

Mark

Stephanie Kennard said she was shocked no one else noticed. What does that tell you?

Mimi

That the scale of what's happening is hard to grasp unless you're watching it. A 20-metre regression doesn't sound like much in words. But if you're standing on a balcony watching a hillside visibly collapse, it's terrifying. The numbers don't match the reality of what your eyes are seeing.

Mark

The review concludes next week. Does this reactivation change what the review will find?

Mimi

It raises a harder question: even if the council had done everything right in January, the mountain is still failing. The underlying instability wasn't solved. That's not a failure of management—it's a failure of the site itself to be safe.

  • The same slope that killed six people in January moved again across three separate events within 48 hours, each displacing soil volumes comparable to the original disaster.
  • Material described as liquefied and fluid traveled 100 metres downslope, forcing road closures and leaving residents like Stephanie Kennard watching the damage grow visibly larger from their balconies.
  • Monitoring equipment detected movement before each slip, giving geotechnical staff just enough warning to keep people clear — but the technology can alert, not prevent.
  • Council recovery manager Charlie Rahiri offered no reassurance about stability, stating plainly that further slips cannot be ruled out and that fresh movement was still visible Sunday morning.
  • The reactivation arrives as an external judicial review into the council's pre-January conduct is set to conclude within days, casting the ongoing instability as both a physical and an accountability crisis.

Six months after a landslide at Mount Maunganui's Beachside Holiday Park claimed six lives, the same slope reactivated over a single July weekend, sending three fresh slips down the hillside in rapid succession. The earth there remains saturated and mobile, a reminder that geological grief does not observe human timelines. As an external review into the original disaster nears its conclusion, the mountain has offered its own unsettling testimony: some wounds in the land do not close — they only wait.

Six months after a landslide tore through Mount Maunganui's Beachside Holiday Park and killed six people, the same slope moved again. Over a single weekend in late July, three separate slips unfolded across Friday night, Saturday morning, and early Sunday — each displacing a volume of earth roughly equivalent to January's disaster. The ground had not finished settling.

Tauranga City Council recovery manager Charlie Rahiri described the material as very wet, liquefied and fluid, with a 20-metre regression opening at the original failure point and debris traveling roughly 100 metres downslope. Adams Avenue was closed between Pilot Bay and the Maunganui Road roundabout, with no reopening date given. Monitoring equipment had detected each slip before it occurred, allowing geotechnical staff to keep people clear — but Rahiri was unambiguous about what came next: further slips could not be ruled out. "Absolutely, it can happen again," he said.

Resident Stephanie Kennard, watching from her apartment balcony overlooking the site, described the transformation as surreal. The slip had grown visibly larger within days, the sheer volume of earth that had given way leaving her unsettled in ways that official alert levels could not quite address. "It's very sad for the mountain and Mauao," she said. "It's very worrying."

The council retained access for residents and businesses via a southern footpath but urged people not to linger. The campground had experienced continuous ground movement across the six months since January, a pattern suggesting the slope had not reached equilibrium. The reactivation arrived with pointed timing: an external review led by retired High Court judge Paul Davison KC, examining what warnings were missed before January's fatal slip, was due to conclude the following week. As that reckoning approached, the mountain was making its own position clear — the danger had never truly passed.

Six months after a landslide tore through Mount Maunganui's Beachside Holiday Park and killed six people, the mountain moved again. Over a single weekend in late July, the same slope that had claimed those lives in January reactivated, sending fresh earth cascading down the hillside in three separate slips that unfolded across Friday night, Saturday morning, and early Sunday. Each slip displaced a volume of soil roughly equivalent to the original January disaster. The ground had not finished settling. It was still hungry.

Tauranga City Council's recovery manager Charlie Rahiri described the material in clinical terms that barely contained the alarm: very wet, liquefied, mobile, fluid. A 20-metre regression had opened up at the original failure point, with debris traveling roughly 100 metres downslope—not quite as far as January's run-out, but far enough to demand closure of Adams Avenue between Pilot Bay and the Maunganui Road roundabout. The council could not say when the road would reopen. Monitoring equipment had detected each slip before it happened, alerting geotechnical staff in time to ensure no one was caught in the path. But the equipment could only warn. It could not stop what was coming.

Rahiri was direct about what lay ahead: further slips could not be ruled out. "Absolutely, it can happen again," he told reporters, noting that fresh movement had been visible on Sunday morning alone. The mountain was not stable. It was not dormant. It was in motion, and the question was not whether it would move again but when.

Stephanie Kennard lived in an apartment overlooking the site. She had watched the new slip grow visibly larger in just a few days, a transformation so dramatic that she found herself shocked no one else seemed to have noticed it happening. Standing on her balcony, she described the view as surreal, the damage as massive. "It's very sad for the mountain and Mauao," she said. "It's very worrying." The slip had happened on her doorstep, literally within sight of where she lived, and the scale of it—the sheer volume of earth that had simply given way—left her unsettled in a way that official statements about alert levels and road closures could not quite capture.

The council had retained access to the area for residents and businesses via a southern footpath, but asked people not to linger. Follow the signage. Follow the directions from staff. Do not stay. The implication was clear: the mountain was not a safe place to be. The campground itself had experienced continuous slips and ground movement in the six months since January's disaster, a pattern of instability that suggested the slope had not reached equilibrium, that the forces at work were still unresolved.

The timing of the reactivation was pointed. An external review of the council's actions leading up to January's fatal slip—led by retired High Court judge Paul Davison KC—was set to conclude the following week. The review had been commissioned to examine what warnings had been missed, what decisions had been made or unmade, what might have prevented six deaths. Now, as that review neared completion, the mountain was answering its own question: the danger had never passed. It had only paused.

It's very wet, it's liquefied, and obviously it's not finished.
— Charlie Rahiri, Tauranga City Council recovery manager
Absolutely, it can happen again.
— Charlie Rahiri, on the likelihood of further slips
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