All earthquakes
1.6
very light
EARTHQUAKE DETAILS

5 km North-East of Sedico

59 months ago · 17 Oct, 20:19

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 74% of Italian events in the past year

Where

5 km North-East of SedicoEarthquakes 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

6 events
Magnitude:lightweakmoderatestrong

The energy released

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

3.8kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×126 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 ≈ 24 s

Animation sped up ~4× compared to reality.

  • Pordenone
    48 km from the epicentre
    first tremor in ~8 s
    main shaking in ~14 s
  • Treviso
    60 km from the epicentre
    first tremor in ~10 s
    main shaking in ~17 s
  • Bolzano
    68 km from the epicentre
    first tremor in ~11 s
    main shaking in ~20 s
  • Trento
    83 km from the epicentre
    first tremor in ~14 s
    main shaking in ~24 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

7 km
shallow

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

in line with the area average (~9 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 (M3.4, 60 months ago) in the same area. Aftershocks are normal after an earthquake and tend to fade over time.

3.4
The mainshock
4 km East of Segusino
60 months ago · 28 Sept, 02:45
Activity in the area right now (30 km radius)
0
last 24 hours
0
last 7 days
4
last 30 days
4 before1 after
this quake
Strongest of the sequence3.4

How often does it happen here?

about every ~29 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 149 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 · 42 km from here
XCompletely destructive: most buildings are destroyed.
18736.3
Alpago Cansiglio earthquake
29 June 1873 · 19 km from here
IX-XCompletely destructive: most buildings are destroyed.
19366.1
Alpago Cansiglio earthquake
18 October 1936 · 22 km from here
IXDestructive: many buildings partly or fully collapse.
17765.8
Prealpi Friulane earthquake
10 July 1776 · 43 km from here
VIII-IXDestructive: many buildings partly or fully collapse.

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

The closest seismic structure

Bassano-Vittorio Veneto

The epicentre lies about 10 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

1.4
60 months ago
8 Oct, 02:55
1.4
3 km North-East of Segusino
29 km South-West · 7 km
60 months ago
29 Sept, 18:14
2.7
3 km East of Segusino
30 km South-West · 10 km
60 months ago
28 Sept, 03:32
3.4
4 km East of Segusino
30 km South-West · 11 km
60 months ago
28 Sept, 02:45
1.7
5 km East of Belluno
13 km South-East · 9 km
59 months ago
9 Nov, 21:18

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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