Earthquake with magnitude of ML 1.7 on date 04-03-2021 and time 07:09:38 (Italy) in region 11 km SE Bronte (CT)

A magnitude ML 1.7 earthquake occured in region: 11 km SE Bronte (CT), on

  • 04-03-2021 06:09:38 (UTC)
  • 04-03-2021 07:09:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.74, 14.94 at 6 km depth.

The earthquake was located by: Sala Operativa INGV_OE (Catania).

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bronte CT 11 19172 19172
Maletto CT 12 3920 23092
Ragalna CT 12 3924 27016
Biancavilla CT 12 24007 51023
Adrano CT 13 36122 87145
Santa Maria di Licodia CT 14 7641 94786
Zafferana Etnea CT 15 9517 104303
Randazzo CT 16 10900 115203
Milo CT 16 1087 116290
Nicolosi CT 16 7463 123753
Belpasso CT 17 28108 151861
Pedara CT 17 14102 165963
Maniace CT 18 3765 169728
Sant'Alfio CT 18 1582 171310
PaternĂ² CT 18 48228 219538
Trecastagni CT 18 10910 230448
Santa Venerina CT 19 8592 239040
Santa Domenica Vittoria ME 20 980 240020
Viagrande CT 20 8563 248583
San Pietro Clarenza CT 20 7743 256326
Camporotondo Etneo CT 20 5023 261349

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NW of Acireale (52622 inhabitants)
29 Km NW of Catania (314555 inhabitants)
74 Km SW of Messina (238439 inhabitants)
74 Km SW of Reggio di Calabria (183035 inhabitants)
82 Km NW of Siracusa (122291 inhabitants)
82 Km E of Caltanissetta (63360 inhabitants)
92 Km N of Ragusa (73313 inhabitants)
95 Km NE of Vittoria (63339 inhabitants)
96 Km NE of Gela (75827 inhabitants)
99 Km N of Modica (54633 inhabitants)
Recent and historical Seismicity
Seismic hazard
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire ( that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 1.7 2021-03-04
37.74 14.94 6 2021-03-04
Sala Operativa INGV_OE (Catania) 87701151
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-03-04 06:09:38
Latitude 37.74
Longitude 14.94
Depth (km) 6 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 200 -> SURVEY-INGV-CT#SeismPicker_SO-OE
Event type earthquake
Origin ID 87701151


Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 1
Number of defining phases 1
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree)
Epicentral distance of station farthest from the epicenter (degree)
Number of stations at which the event was observed 0
Number of stations from which data was used for origin computation 0
Magnitude information


Field Value
Value 1.7
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 87701151
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-03-04 06:29:12
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download