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2.5
light
EARTHQUAKE DETAILS

1 km North-East of Limbadi

114 months ago · 24 Apr, 16:08

A light earthquake, rarely felt by people. At this depth the shaking is felt, but rarely causes damage.

Stronger than 96% of Italian events in the past year

Where

1 km North-East of LimbadiEarthquakes in the province of Vibo ValentiaEarthquakes 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

5 events
Magnitude:lightweakmoderatestrong

The energy released

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

85kgof TNT equivalent
Less than the energy of a lightning bolt
M3
A magnitude 3 earthquake releases ×5.6 its energy
M2this quakeM4

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 ≈ 19 s

Animation sped up ~4× compared to reality.

  • Lamezia Terme
    50 km from the epicentre
    first tremor in ~9 s
    main shaking in ~16 s
  • Reggio di Calabria
    57 km from the epicentre
    first tremor in ~10 s
    main shaking in ~18 s
  • Messina
    59 km from the epicentre
    first tremor in ~11 s
    main shaking in ~18 s
  • Catanzaro
    64 km from the epicentre
    first tremor in ~11 s
    main shaking in ~19 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

22 km
medium depth
2.5 times the height of Mount Everest

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

shallower than the area average (~51 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?

Isolated quake

In the 30 days around this event no other quakes were recorded within 30 km: a one-off episode, very common in Italy.

Activity in the area right now (30 km radius)
1
last 24 hours
1
last 7 days
16
last 30 days
2 before2 after
this quake
Strongest of the sequence1.9

How often does it happen here?

about every ~15 days

Within 50 km of this epicentre, a magnitude ≥ 2.5 earthquake has occurred on average this often: 293 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.

17837.1
Calabria meridionale earthquake
5 February 1783 · 31 km from here
XICatastrophic: very few buildings remain standing; landslides and ground cracks.
17837.0
Calabria centrale earthquake
28 March 1783 · 47 km from here
XICatastrophic: very few buildings remain standing; landslides and ground cracks.
19057.0
Calabria centrale earthquake
8 September 1905 · 26 km from here
X-XICatastrophic: very few buildings remain standing; landslides and ground cracks.
17836.7
Calabria centrale earthquake
7 February 1783 · 18 km from here
X-XICatastrophic: very few buildings remain standing; landslides and ground cracks.

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

The closest seismic structure

Nicotera-Roccella Ionica

The epicentre lies about 5 km from Nicotera-Roccella Ionica, one of the seismic structures mapped by INGV geologists.

estimated maximum magnitude 6.9between 3 and 12 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

1.3
6 km North-West of Palmi
20 km South-West · 10 km
114 months ago
10 Apr, 14:10
1.7
2 km South of Francica
12 km East · 10 km
114 months ago
7 Apr, 02:17
1.9
113 months ago
13 May, 21:27
1.6
1 km South-West of Cittanova
24 km South · 8 km
113 months ago
21 May, 05:57

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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