All earthquakes
1.5
very light
EARTHQUAKE DETAILS

M1.5 earthquake · 2 km South-West of Malo (VI)

9 years ago · 11 Jul 2017, 11:34

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 69% of Italian events in the past year

Where

2 km South-West of MaloEarthquakes 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

8 events
Magnitude:lightweakmoderatestrong

The energy released

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

2.7kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×178 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 ≈ 15 s

Animation sped up ~3× compared to reality.

  • Vicenza
    15 km from the epicentre
    first tremor in ~3 s
    main shaking in ~5 s
  • Verona
    39 km from the epicentre
    first tremor in ~7 s
    main shaking in ~11 s
  • Padova
    45 km from the epicentre
    first tremor in ~8 s
    main shaking in ~13 s
  • Trento
    51 km from the epicentre
    first tremor in ~9 s
    main shaking in ~15 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

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

in line with the area average (~11 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, 9 years ago) in the same area. Aftershocks are normal after an earthquake and tend to fade over time.

2.1
The mainshock
4 km East of Lusiana Conco
9 years ago · 11 Jun 2017, 13:51
Activity in the area right now (30 km radius)
0
last 24 hours
2
last 7 days
3
last 30 days
3 before4 after
this quake
Strongest of the sequence2.1

How often does it happen here?

about every ~42 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 103 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 · 45 km from here
XCompletely destructive: most buildings are destroyed.
18915.9
Valle d'Illasi earthquake
7 June 1891 · 21 km from here
IXDestructive: many buildings partly or fully collapse.
18365.5
Asolano earthquake
12 June 1836 · 37 km from here
VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.
19195.0
Asolano earthquake
12 July 1919 · 43 km from here
V-VIStrong: felt by everyone, many get scared; objects fall, first light damage to buildings.

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

The closest seismic structure

Schio-Vicenza

The epicentre lies about 1 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
3 km East of Pedemonte
30 km North · 15 km
9 years ago
2 Jul 2017, 09:43
0.8
4 km East of Vallarsa
26 km North-West · 13 km
9 years ago
22 Jul 2017, 06:29
1.1
9 years ago
23 Jul 2017, 21:26
1.1
3 km South of Lastebasse
27 km North-West · 17 km
9 years ago
2 Aug 2017, 12:33
0.9
1 km South-East of Vallarsa
28 km North-West · 15 km
9 years ago
17 Jun 2017, 02:18
1.0
2 km North-West of Valli del Pasubio
22 km North-West · 11 km
9 years ago
5 Aug 2017, 21:07
2.1
4 km East of Lusiana Conco
27 km North-East · 7 km
9 years ago
11 Jun 2017, 13:51

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).