RE: [SOCIAL NETWORK] Earthquake near Woods Point, Victoria [SEC=OFFICIAL]
Trevor Allen
Hi John and all,
Just following on from your comments on the correspondence of damage potential and geotechnical conditions, I just wanted to point members to GA’s online felt reports for the event. We received almost 43,000 felt reports for the event (an absolutely amazing citizen science contribution!), which we were able to use to estimate Modified Mercalli Intensities, aggregated at several spatial scales (20, 10, 5 & 1 km). Whilst I acknowledge there may be some uncertainties around unverified responses from citizens, studies elsewhere in the world have found that they are remarkably reliable, to the first order. To view the reported intensities, click on the link below, scroll to the bottom of the panel on the right, and click on “Felt Grid” – then zoom in to your area of interest.
https://earthquakes.ga.gov.au/event/ga2021sqogij
I personally cannot see any obvious trends within Melbourne that might account for the damage seen on Chapel St, but note that the smallest 1-km resolution may still be too coarse to see such details. Note that there may be some isolated cells that indicate higher intensities than surrounding cells, but oftentimes when you click on these cells, they may only contributed from a single response. As such I would not consider them to be overly reliable without further verification.
No doubt, we’ll be learning a lot more from these data in the years to come!
Cheers,
Trev
From: aee...@googlegroups.com <aee...@googlegroups.com>
On Behalf Of geor...@bigpond.net.au
Sent: Saturday, 25 September 2021 8:42 AM
To: aee...@googlegroups.com
Subject: [SOCIAL NETWORK] RE: [aees] Melbourne earthquake
John
Reminds me of the Townsville earthquake back in the late 80's I think it was. I was woken up by the windows rattling - sounded as if someone thrown small gravel at them - but nothing else and there were few reports of significant effects except one old house that reported significant damage. It turned out there was an old disused sewer beneath it which had collapsed, probably because it was already on the point of collapse.
George Walker
229/96 Village Way
Little Mountain Qld 4551 Australia
Home Phone: +61 7 5212 6229
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From:
aee...@googlegroups.com <aee...@googlegroups.com>
On Behalf Of john.s...@sgrs.com.au
Sent: Friday, 24 September 2021 12:45 PM
To: aee...@googlegroups.com
Subject: RE: [aees] Melbourne earthquake
My daughter was working from home about 400m from that building. She reported the movement and noise, and they later scouted around her block and saw no damage. Nothing came off their shelves. Nothing was reported amiss at my grandson’s kinder, also close to the damaged building. I am not aware of any systematic survey of shops along Chapel Street regarding items displaced from shelves (etc). That area was first settled more than a century ago and the heritage buildings around there show little sign of the cumulative damage & repairs that would be expected if there was a significant soft soil profile in the area. All such observations can’t rule out a local geotechnical reason, but it seems more likely that there were some structural deficiencies in the damaged building.
Cheers
John Simmons
Sherwood Geotechnical and Research Services
From: 'Robert Koch' via aeesorg <aee...@googlegroups.com>
Sent: Friday, 24 September 2021 12:17
To: aee...@googlegroups.com
Subject: Re: [aees] Melbourne earthquake
Thankyou all for interesting comments on the extent of local damage being apparently low.
In regards the damaged building featured in the news broadcasts, apart from obviously the structural deficiencies likely present (eg unsupported masonry parapet, defective masonry tie-in to the roof & cross walls), is anyone aware of any specific local geotechnical reasons that the building response might have been more extreme than elsewhere ?
Thankyou
Robert K
CaSE Design
Robert Koch
Sent from my iPhone
On 24 Sep 2021, at 11:56 am, Robert Koch <rko...@me.com> wrote:
Anne
Interesting that seems that building in Melbourne wax the main place damaged
Robert Koch
Sent from my iPhone
Begin forwarded message:From: da...@earthquake.net.au
Date: 24 September 2021 at 11:08:01 am AEST
To: aee...@googlegroups.com
Subject: RE: [aees] Melbourne earthquake
Reply-To: aee...@googlegroups.com
Hi all
Sounds like the second USGS moment tensor might be close – 21.5km
https://earthquake.usgs.gov/earthquakes/eventpage/us7000fd9v/moment-tensor
Will be interesting to see aftershock depths if units can be located well in that terrain.
Regards
David
From: aee...@googlegroups.com <aee...@googlegroups.com> On Behalf Of Ninis, Dee
Sent: Friday, 24 September 2021 10:09 AM
To: aee...@googlegroups.com
Subject: Re: [aees] Melbourne earthquake
Hi all,
Thanks Jordan for the update from Enochs Point!
Wayne Peck from SRC has spoken to the owners of the Woods Point pub, and they also reported no damage.
Wayne is on his way up there now, to meet with colleagues from Melbourne Uni and deploy the aftershock network, so we will have more news from him, I suspect, in the coming days.
Dee
On Thu, Sep 23, 2021 at 11:50 PM Jordan Bartlett <frbr...@hotmail.com> wrote:
Howdy All, and thank you Scott for the prompt,
I am now approximately 20km from the epicentre @ Enochs Point as I write this: a quick trip to check my own family cabin and there is no visible damage at any of the 15 cabins in the valley. The cabins are a mix of URM and wood structures and there were no broken windows, no visible cracks in the mortar joints and even the loose shale roadsides seem undisturbed. I saw a few dead branches at a campsite, although they could have dislodged at any time in the past month of wind events.
Within our cabin is a range of elements I expected to be toppled, and the only element displaced was a hand saw that was stored vertically between other tools had dropped within the pack and was facing blade upwards. I met with another couple when investigating the local cabins and they had found two food cans on the floor of their pantry.
I heard rumours of windows displacing at the Mansfield Courthouse, although upon calling the Shire Council reception I heard that was incorrect, was then transferred to building surveyors and they said they had no damage to their structures. I am awaiting a callback from the main surveyor, but their assets appear unaffected.
If anyone has anything in the region they would like me to check I’d be happy to. Visiting Woods point is a bit of an effort, but if it’s valuable I would do it tomorrow (Friday) after lunch.
Regards,
Jordan
0411 12 13 19
From: aee...@googlegroups.com <aee...@googlegroups.com> On Behalf Of Scott Menegon
Sent: Thursday, 23 September 2021 10:54 PM
To: aee...@googlegroups.com
Subject: [aees] Melbourne earthquake
It was good to see AEES member Adam Pascale on ABC 7.30 last night! I've also seen our President Trevor Allen as well.
I wonder if anyone has heard (or seen) any reports of damage out closer to the epicentre? I appreciate it's pretty sparsely populated out that way though (luckily). I have a friend in Mansfield and Mt Bulla, and he has reported no damage to his knowledge.
Kind regards,
Scott
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Adam Pascale
- Closest station to the main event was TOT, which clipped out all channels of its seismometer.
- The horizontal channels of GLMM, JEER, WILL, and DTMM also clipped out.
- GLMM (the closest station which only just clipped out) when converted from velocity to acceleration works out to a 3D PGA of 0.11g at 63km hypo central distance.
- CDNM was the closest actual accelerograph and shows PGA of 0.015g at 109km.
- A seismometer running at our office recorded a PGA of 0.0335g. This seismograph is just under 5km from the site of the URM collapse in Chapel Street.
- Recording of this SRCHQ station attached. Download Waves to view and use as you please. Data can be exported to CSV from Waves if you want to process the data in other ways.
