All earthquakes
1.9
very light
EARTHQUAKE DETAILS

M1.9 earthquake · 2 km West of San Pietro di Morubio (VR)

6 years ago · 20 Nov 2019, 17:09

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

Stronger than 85% of Italian events in the past year

Where

2 km West of San Pietro di MorubioEarthquakes 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

5 events
Magnitude:lightweakmoderatestrong

The energy released

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

11kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×45 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 ≈ 16 s

Animation sped up ~3× compared to reality.

  • Verona
    26 km from the epicentre
    first tremor in ~5 s
    main shaking in ~9 s
  • Vicenza
    46 km from the epicentre
    first tremor in ~8 s
    main shaking in ~14 s
  • Rovigo
    52 km from the epicentre
    first tremor in ~9 s
    main shaking in ~16 s
  • Carpi
    54 km from the epicentre
    first tremor in ~10 s
    main shaking in ~16 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

18 km
medium depth
2 times the height of Mount Everest

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

deeper than 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?

Foreshock

In hindsight it was a foreshock: 6 years ago the same area had a stronger quake (M3.2). This can only be said after the fact — it was not predictable beforehand.

3.2
The mainshock
2 km South of Vigasio
6 years ago · 7 Dec 2019, 03:29
Activity in the area right now (30 km radius)
0
last 24 hours
0
last 7 days
0
last 30 days
2 before2 after
this quake
Strongest of the sequence3.2

How often does it happen here?

about every ~23 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 189 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.

11176.5
Veronese earthquake
3 January 1117 · 13 km from here
IXDestructive: many buildings partly or fully collapse.
20126.1
Pianura emiliana earthquake
20 May 2012 · 39 km from here
VIIVery strong: hard to stand; chimneys and roof tiles fall, serious damage to weaker buildings.
20125.9
Pianura emiliana earthquake
29 May 2012 · 45 km from here
VIIIRuinous: partial collapses in ordinary buildings, widespread heavy damage.
18915.9
Valle d'Illasi earthquake
7 June 1891 · 36 km from here
IXDestructive: many buildings partly or fully collapse.

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

The closest seismic structure

Adige Plain

The epicentre lies about 2 km from Adige Plain, one of the seismic structures mapped by INGV geologists.

estimated maximum magnitude 7.2between 3 and 14 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

2.1
2 km West of San Pietro di Morubio
1 km North-East · 19 km
6 years ago
20 Nov 2019, 17:07
2.7
6 years ago
20 Nov 2019, 17:06
3.2
2 km South of Vigasio
19 km West · 8 km
6 years ago
7 Dec 2019, 03:29
1.6
3 km South-East of Vigasio
18 km West · 11 km
6 years ago
7 Dec 2019, 06:53

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).