All earthquakes
1.3
very light
EARTHQUAKE DETAILS

M1.3 earthquake · 3 km West of Paludi (CS)

5 years ago · 1 Dec 2020, 13:02

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

Stronger than 55% of Italian events in the past year

Where

3 km West of PaludiEarthquakes in the province of CosenzaEarthquakes in Calabria

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.

1.3kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×355 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 ≈ 21 s

Animation sped up ~4× compared to reality.

  • Corigliano-Rossano
    21 km from the epicentre
    first tremor in ~5 s
    main shaking in ~9 s
  • Cosenza
    43 km from the epicentre
    first tremor in ~8 s
    main shaking in ~14 s
  • Crotone
    60 km from the epicentre
    first tremor in ~11 s
    main shaking in ~18 s
  • Lamezia Terme
    71 km from the epicentre
    first tremor in ~12 s
    main shaking in ~21 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

23 km
medium depth
2.6 times the height of Mount Everest

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

in line with the area average (~18 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: 5 years ago the same area had a stronger quake (M2.1). This can only be said after the fact — it was not predictable beforehand.

2.1
The mainshock
5 km North of Celico
5 years ago · 13 Dec 2020, 22:25
Activity in the area right now (30 km radius)
0
last 24 hours
3
last 7 days
11
last 30 days
2 before3 after
this quake
Strongest of the sequence2.1

How often does it happen here?

about every ~8 days

Within 50 km of this epicentre, a magnitude ≥ 2 earthquake has occurred on average this often: 521 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.

16386.8
Crotonese earthquake
8 June 1638 · 31 km from here
XCompletely destructive: most buildings are destroyed.
11846.8
Valle del Crati earthquake
24 May 1184 · 42 km from here
IXDestructive: many buildings partly or fully collapse.
18546.3
Cosentino earthquake
12 February 1854 · 43 km from here
XCompletely destructive: most buildings are destroyed.
18706.2
Cosentino earthquake
4 October 1870 · 44 km from here
XCompletely destructive: most buildings are destroyed.

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

The closest seismic structure

Cecita Lake

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

estimated maximum magnitude 7.1between 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

0.9
3 km North-East of Acri
16 km West · 11 km
5 years ago
30 Nov 2020, 16:14
2.1
5 km North of Celico
25 km South-West · 14 km
5 years ago
13 Dec 2020, 22:25
1.5
6 km North of Celico
24 km South-West · 12 km
5 years ago
15 Dec 2020, 00:52
0.8
5 km West of Acri
24 km West · 10 km
5 years ago
16 Dec 2020, 00:29
1.7
5 km South-West of Acri
23 km West · 11 km
5 years ago
10 Nov 2020, 22:11

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).