All earthquakes
0.9
very light
EARTHQUAKE DETAILS

M0.9 earthquake · 2 km South-East of Sovramonte (BL)

6 years ago · 8 Oct 2020, 22:10

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 23% of Italian events in the past year

Where

2 km South-East of SovramonteEarthquakes in the province of BellunoEarthquakes 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

7 events
Magnitude:lightweakmoderatestrong

The energy released

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

0.3kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×1,413 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 ≈ 18 s

Animation sped up ~3× compared to reality.

  • Treviso
    54 km from the epicentre
    first tremor in ~9 s
    main shaking in ~16 s
  • Trento
    56 km from the epicentre
    first tremor in ~10 s
    main shaking in ~16 s
  • Bolzano
    59 km from the epicentre
    first tremor in ~10 s
    main shaking in ~17 s
  • Vicenza
    61 km from the epicentre
    first tremor in ~10 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

9 km
shallow
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 (~8 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 (M1.6, 6 years ago) in the same area. Aftershocks are normal after an earthquake and tend to fade over time.

1.6
The mainshock
1 km North-West of Valdobbiadene
6 years ago · 5 Oct 2020, 18:38
Activity in the area right now (30 km radius)
0
last 24 hours
0
last 7 days
1
last 30 days
4 before2 after
this quake
Strongest of the sequence1.6

How often does it happen here?

about every ~46 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 93 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 · 24 km from here
XCompletely destructive: most buildings are destroyed.
18736.3
Alpago Cansiglio earthquake
29 June 1873 · 44 km from here
IX-XCompletely destructive: most buildings are destroyed.
19366.1
Alpago Cansiglio earthquake
18 October 1936 · 42 km from here
IXDestructive: many buildings partly or fully collapse.
18365.5
Asolano earthquake
12 June 1836 · 29 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

Bassano-Vittorio Veneto

The epicentre lies about 13 km from Bassano-Vittorio Veneto, one of the seismic structures mapped by INGV geologists.

estimated maximum magnitude 6.9between 1 and 10 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

1.6
1 km North-West of Valdobbiadene
21 km South-East · 9 km
6 years ago
5 Oct 2020, 18:38
0.9
5 km East of Predazzo
30 km North-West · 7 km
5 years ago
22 Oct 2020, 11:02
1.0
6 years ago
21 Sept 2020, 10:24
1.1
3 km East of Sagron Mis
17 km North-East · 10 km
5 years ago
31 Oct 2020, 21:18
1.6
2 km North-West of Pedavena
1 km South-East · 7 km
6 years ago
15 Sept 2020, 21:24
1.3
4 km West of Belluno
27 km East · 11 km
6 years ago
11 Sept 2020, 12:03

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).