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3.3
weak
EARTHQUAKE DETAILS

9 km South-East of Taormina

128 months ago · 11 Feb, 02:38

A weak earthquake, felt by some of the population. At this depth the shaking is felt, but rarely causes damage.

Stronger than 99% of Italian events in the past year

Where

9 km South-East of TaorminaEarthquakes in the province of MessinaEarthquakes in Sicilia

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

14 events
Magnitude:lightweakmoderatestrong

The energy released

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

1.3tof TNT equivalent
5.6 lightning bolts
M3
×2.8 the energy of a magnitude 3 earthquake
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 ≈ 16 s

Animation sped up ~3× compared to reality.

  • Acireale
    27 km from the epicentre
    first tremor in ~7 s
    main shaking in ~12 s
  • Reggio di Calabria
    44 km from the epicentre
    first tremor in ~9 s
    main shaking in ~15 s
  • Messina
    44 km from the epicentre
    first tremor in ~9 s
    main shaking in ~15 s
  • Catania
    48 km from the epicentre
    first tremor in ~9 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

30 km
medium depth
3.3 times the height of Mount Everest

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

deeper than the area average (~12 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)
0
last 24 hours
1
last 7 days
16
last 30 days
4 before9 after
this quake
Strongest of the sequence2.6

How often does it happen here?

about every ~26 days

Within 50 km of this epicentre, a magnitude ≥ 3 earthquake has occurred on average this often: 164 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.

19087.1
Stretto di Messina earthquake
28 December 1908 · 46 km from here
XICatastrophic: very few buildings remain standing; landslides and ground cracks.
18186.3
Catanese earthquake
20 February 1818 · 31 km from here
IX-XCompletely destructive: most buildings are destroyed.
17866.1
Golfo di Patti earthquake
10 March 1786 · 45 km from here
IXDestructive: many buildings partly or fully collapse.
17495.8
Messina earthquake
August 1749 · 45 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

Patti-Giardini

The epicentre sits above this source area: the deep structure where this area's earthquakes can originate.

estimated maximum magnitude 7.1between 3 and 20 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

2.0
18 km East of Riposto
20 km South · 5 km
128 months ago
21 Feb, 23:35
1.9
18 km South-East of Riposto
21 km South · 6 km
128 months ago
21 Feb, 23:37
1.3
129 months ago
30 Jan, 20:52
1.9
21 km East of Riposto
21 km South · 6 km
128 months ago
22 Feb, 14:20
2.5
2 km South of Giarre
23 km South-West · 7 km
128 months ago
25 Feb, 15:42
1.3
2 km South-West of Giarre
23 km South-West · 9 km
128 months ago
25 Feb, 18:03
1.9
14 km South-East of Riposto
20 km South · 6 km
128 months ago
26 Feb, 03:24
1.2
11 km South-East of Alì Terme
20 km North-East · 6 km
129 months ago
22 Jan, 09:29
2.3
2 km East of Milo
24 km West · 9 km
129 months ago
22 Jan, 08:00
2.6
10 km East of Taormina
1 km North-East · 30 km
128 months ago
3 Mar, 06:16

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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