Earthquake with magnitude of ML 1.5 on date 21-07-2021 and time 01:53:40 (Italy) in region 2 km W Ragalna (CT)

A magnitude ML 1.5 earthquake occured in region: 2 km W Ragalna (CT), on

  • 20-07-2021 23:53:40 (UTC)
  • 21-07-2021 01:53:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.638, 14.921 at 7 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
Ragalna CT 2 3924 3924
Santa Maria di Licodia CT 4 7641 11565
Biancavilla CT 5 24007 35572
PaternĂ² CT 7 48228 83800
Belpasso CT 7 28108 111908
Adrano CT 8 36122 148030
Nicolosi CT 10 7463 155493
Camporotondo Etneo CT 11 5023 160516
San Pietro Clarenza CT 12 7743 168259
Pedara CT 13 14102 182361
Mascalucia CT 14 31958 214319
Trecastagni CT 14 10910 225229
Motta Sant'Anastasia CT 15 12116 237345
Misterbianco CT 15 49410 286755
Tremestieri Etneo CT 15 20589 307344
Gravina di Catania CT 15 25838 333182
Viagrande CT 16 8563 341745
Centuripe EN 16 5470 347215
Sant'Agata li Battiati CT 17 9479 356694
San Giovanni la Punta CT 17 23060 379754
Aci Bonaccorsi CT 17 3524 383278
Zafferana Etnea CT 17 9517 392795
San Gregorio di Catania CT 18 11966 404761
Bronte CT 18 19172 423933
Aci Sant'Antonio CT 18 17984 441917
Valverde CT 19 7840 449757
Milo CT 20 1087 450844
Aci Catena CT 20 29851 480695

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NW of Catania (314555 inhabitants)
22 Km W of Acireale (52622 inhabitants)
72 Km NW of Siracusa (122291 inhabitants)
77 Km E of Caltanissetta (63360 inhabitants)
81 Km N of Ragusa (73313 inhabitants)
82 Km SW of Reggio di Calabria (183035 inhabitants)
83 Km SW of Messina (238439 inhabitants)
84 Km NE of Vittoria (63339 inhabitants)
87 Km NE of Gela (75827 inhabitants)
88 Km N of Modica (54633 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.5 2021-07-20
37.638 14.921 7 2021-07-21
Sala Operativa INGV_OE (Catania) 93002191
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-07-20 23:53:40
Latitude 37.6380
Longitude 14.9210
Depth (km) 7 (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 93002191


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) 1100
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
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) 0.26
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 1.5
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 93002191
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-07-21 00:07:04
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download