All earthquakes
0.8
very light
EARTHQUAKE DETAILS

2 km West of Cogollo del Cengio

25 months ago · 22 Aug, 01:50

A very light earthquake, probably not felt by people. At only a few km deep the shaking is felt more sharply at the surface.

Stronger than 16% of Italian events in the past year

Where

2 km West of Cogollo del CengioEarthquakes in the province of VicenzaEarthquakes in Veneto

How far away could it be felt?

A quake this small is usually not felt by people: only seismographs record it.

Statistical estimate from the Italian intensity attenuation model (INGV): actual perception depends on geology, buildings and depth. Very shallow events can be felt locally even below the threshold.

Earthquake map

23 events
Magnitude:lightweakmoderatestrong

The energy released

How much energy this quake unleashed, translated into everyday comparisons.

0.2kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×1,995 its energy
M0this quakeM2

Each extra magnitude unit releases about 32 times more energy: an M5 is not "a bit stronger" than an M4 — it is a different league.

Energy estimated with the standard Gutenberg–Richter relation; an average lightning bolt ≈ 1 billion joules. Indicative values.

The race of the seismic waves

Two waves set off from the hypocentre: the faster P wave arrives first with a sharp jolt; the S wave carries the actual shaking.

P waves — the first sharp jolt (~6 km/s)S waves — the strongest shaking (~3.5 km/s)
t ≈ 17 s

Animation sped up ~3× compared to reality.

  • Vicenza
    31 km from the epicentre
    first tremor in ~5 s
    main shaking in ~9 s
  • Trento
    35 km from the epicentre
    first tremor in ~6 s
    main shaking in ~10 s
  • Verona
    51 km from the epicentre
    first tremor in ~9 s
    main shaking in ~15 s
  • Padova
    59 km from the epicentre
    first tremor in ~10 s
    main shaking in ~17 s

Theoretical times with average crustal speeds: real values vary with geology. The gap between P and S waves is what earthquake early-warning systems rely on.

How deep it was born

10 km
shallow
1.1 times the height of Mount Everest

At only a few km deep the shaking is felt more sharply at the surface.

in line with the area average (~6 km)

For the same magnitude, a shallow earthquake is felt much more than a deep one: the energy starts closer to the surface.

What kind of quake is this?

Foreshock

In hindsight it was a foreshock: 24 months ago the same area had a stronger quake (M1.4). This can only be said after the fact — it was not predictable beforehand.

1.4
The mainshock
3 km South of Vallarsa
24 months ago · 30 Aug, 04:32
Activity in the area right now (30 km radius)
0
last 24 hours
0
last 7 days
9
last 30 days
4 before18 after
this quake
Strongest of the sequence1.4

How often does it happen here?

about every ~35 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 122 events in the last 12 years of the INGV catalogue.

An average computed on the recent past: it tells how used this area is to shaking, not when the next quake will come — earthquakes cannot be predicted.

The great earthquakes in this area's history

Almost a thousand years of catalogues: the strongest documented events within ~50 km.

16956.4
Asolano earthquake
25 February 1695 · 40 km from here
XCompletely destructive: most buildings are destroyed.
18915.9
Valle d'Illasi earthquake
7 June 1891 · 33 km from here
IXDestructive: many buildings partly or fully collapse.
18365.5
Asolano earthquake
12 June 1836 · 33 km from here
VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.
19435.1
Feltrino earthquake
24 July 1943 · 42 km from here
VIIVery strong: hard to stand; chimneys and roof tiles fall, serious damage to weaker buildings.

Source: Parametric Catalogue of Italian Earthquakes CPTI15 (INGV, CC BY 4.0).

The closest seismic structure

Schio-Vicenza

The epicentre lies about 6 km from Schio-Vicenza, one of the seismic structures mapped by INGV geologists.

estimated maximum magnitude 7.3between 1 and 15 km deep

Faults are mapped to build better and understand the territory: knowing them says nothing about when an earthquake will occur, which remains unpredictable. Source: DISS 3.3 (INGV, CC BY 4.0).

Other quakes in the area

1.1
1 km East of Nove
25 km East · 8 km
24 months ago
22 Aug, 10:22
0.9
25 months ago
20 Aug, 22:53
0.8
4 km West of Vallarsa
26 km West · 7 km
24 months ago
23 Aug, 16:00
0.7
4 km South-West of Rovereto
29 km West · 14 km
24 months ago
24 Aug, 12:11
0.7
5 km South-West of Rovereto
30 km West · 16 km
24 months ago
24 Aug, 12:22
1.0
5 km South-West of Rovereto
29 km West · 15 km
24 months ago
24 Aug, 16:20
1.1
2 km West of Arsiero
10 km West · 15 km
24 months ago
24 Aug, 17:15
1.2
5 km South of Rovereto
29 km West · 14 km
24 months ago
24 Aug, 20:41
0.7
5 km South-West of Rovereto
29 km West · 15 km
24 months ago
24 Aug, 21:32
0.9
4 km South of Rovereto
29 km West · 16 km
24 months ago
24 Aug, 22:20

Data: INGV — National Institute of Geophysics and Volcanology (CC-BY 4.0)

Estimates computed by Meteare on INGV data (Gutenberg–Richter relation; Italian macroseismic intensity attenuation model).

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