All earthquakes
0.8
very light
EARTHQUAKE DETAILS

5 km North of Torri del Benaco

106 months ago · 20 Dec, 03:22

A very light earthquake, probably not felt by people. At this depth the shaking is felt, but rarely causes damage.

Stronger than 16% of Italian events in the past year

Where

5 km North of Torri del BenacoEarthquakes in the province of VeronaEarthquakes 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

10 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 ≈ 20 s

Animation sped up ~4× compared to reality.

  • Verona
    34 km from the epicentre
    first tremor in ~6 s
    main shaking in ~11 s
  • Brescia
    40 km from the epicentre
    first tremor in ~7 s
    main shaking in ~12 s
  • Trento
    53 km from the epicentre
    first tremor in ~9 s
    main shaking in ~16 s
  • Vicenza
    68 km from the epicentre
    first tremor in ~12 s
    main shaking in ~20 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

17 km
medium depth
1.9 times the height of Mount Everest

At this depth the shaking is felt, but rarely causes damage.

deeper than the area average (~10 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: 105 months ago the same area had a stronger quake (M2.3). This can only be said after the fact — it was not predictable beforehand.

2.3
The mainshock
1 km South-East of Caino
105 months ago · 30 Dec, 07:37
Activity in the area right now (30 km radius)
0
last 24 hours
1
last 7 days
5
last 30 days
5 before4 after
this quake
Strongest of the sequence2.3

How often does it happen here?

about every ~30 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 142 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.

18915.9
Valle d'Illasi earthquake
7 June 1891 · 38 km from here
IXDestructive: many buildings partly or fully collapse.
12225.7
Bresciano-Veronese earthquake
25 December 1222 · 15 km from here
19015.4
Garda occidentale earthquake
30 October 1901 · 18 km from here
VII-VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.
16935.2
Mantovano earthquake
6 July 1693 · 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

Giudicarie

The epicentre sits above this source area: the deep structure where this area's earthquakes can originate.

estimated maximum magnitude 6.8between 5 and 12 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

1.3
4 km North of Nago-Torbole
29 km North-East · 11 km
106 months ago
18 Dec, 08:44
1.5
4 km North-West of Ala
27 km East · 11 km
106 months ago
17 Dec, 13:09
1.4
5 km North-West of Ala
28 km East · 10 km
106 months ago
24 Dec, 04:44
2.3
1 km South-East of Caino
28 km West · 26 km
105 months ago
30 Dec, 07:37
1.0
5 km North-West of Ala
28 km East · 8 km
105 months ago
30 Dec, 23:08
0.8
3 km North-East of Ala
30 km East · 10 km
106 months ago
8 Dec, 21:46
1.8
2 km North-East of Gargnano
9 km North-West · 10 km
105 months ago
2 Jan, 09:01
1.8
4 km North-West of Ala
27 km East · 10 km
107 months ago
28 Nov, 01:28
1.4
1 km East of Brentonico
27 km North-East · 15 km
107 months ago
25 Nov, 04:19

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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