All earthquakes
1.7
very light
EARTHQUAKE DETAILS

3 km North-East of Vestone

47 months ago · 4 Oct, 19:55

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 78% of Italian events in the past year

Where

3 km North-East of VestoneEarthquakes in the province of BresciaEarthquakes in Lombardia

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

8 events
Magnitude:lightweakmoderatestrong

The energy released

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

5.4kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×89 its energy
M1this quakeM3

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 ≈ 18 s

Animation sped up ~3× compared to reality.

  • Brescia
    27 km from the epicentre
    first tremor in ~5 s
    main shaking in ~8 s
  • Verona
    56 km from the epicentre
    first tremor in ~9 s
    main shaking in ~16 s
  • Bergamo
    59 km from the epicentre
    first tremor in ~10 s
    main shaking in ~17 s
  • Trento
    64 km from the epicentre
    first tremor in ~11 s
    main shaking in ~18 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

6 km
shallow

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

in line with 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?

Aftershock

It is an aftershock: it follows a stronger quake (M2.1, 48 months ago) in the same area. Aftershocks are normal after an earthquake and tend to fade over time.

2.1
The mainshock
7 km South of Tignale
48 months ago · 18 Sept, 05:00
Activity in the area right now (30 km radius)
0
last 24 hours
0
last 7 days
5
last 30 days
4 before3 after
this quake
Strongest of the sequence2.1

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: 141 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.

12225.7
Bresciano-Veronese earthquake
25 December 1222 · 27 km from here
19015.4
Garda occidentale earthquake
30 October 1901 · 17 km from here
VII-VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.
19325.2
Garda orientale earthquake
19 February 1932 · 27 km from here
VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.
10655.1
Brescia earthquake
27 March 1065 · 26 km from here
VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.

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

The closest seismic structure

Giudicarie

The epicentre lies about 11 km from Giudicarie, one of the seismic structures mapped by INGV geologists.

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

1.4
48 months ago
27 Sept, 19:18
1.1
7 km South of Tignale
23 km East · 10 km
48 months ago
18 Sept, 11:49
1.3
6 km South of Tignale
23 km East · 9 km
48 months ago
18 Sept, 06:26
2.1
7 km South of Tignale
22 km East · 8 km
48 months ago
18 Sept, 05:00
1.0
4 km South of Pieve di Bono-Prezzo
27 km North-East · 10 km
47 months ago
26 Oct, 01:39
1.5
1 km South-West of Caino
15 km South-West · 1 km
47 months ago
28 Oct, 15:50
1.3
2 km North-West of Moniga del Garda
23 km South-East · 7 km
47 months ago
29 Oct, 07:07

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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