Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 20-07-2021 and time 23:26:16 (Italy) in region 4 km W Roccafiorita (ME)

A magnitude ML 1.3 earthquake occured in region: 4 km W Roccafiorita (ME), on

  • 20-07-2021 21:26:16 (UTC)
  • 20-07-2021 23:26:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.9340, 15.2270 at 20 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Roccafiorita ME 4 197 197
Limina ME 4 836 1033
Graniti ME 5 1492 2525
Antillo ME 5 919 3444
Mongiuffi Melia ME 5 600 4044
Motta Camastra ME 6 845 4889
Gallodoro ME 7 367 5256
Fondachelli-Fantina ME 8 1019 6275
Gaggi ME 8 3184 9459
Francavilla di Sicilia ME 9 3945 13404
Casalvecchio Siculo ME 9 842 14246
Letojanni ME 9 2861 17107
Castelmola ME 9 1088 18195
Forza d'Agrò ME 10 911 19106
Savoca ME 10 1732 20838
Taormina ME 10 10960 31798
Sant'Alessio Siculo ME 11 1554 33352
Castiglione di Sicilia CT 11 3215 36567
Mandanici ME 11 601 37168
Giardini-Naxos ME 11 9415 46583
Calatabiano CT 12 5308 51891
Novara di Sicilia ME 12 1337 53228
Santa Teresa di Riva ME 13 9377 62605
Linguaglossa CT 13 5403 68008
Pagliara ME 13 1170 69178
Furci Siculo ME 14 3382 72560
Piedimonte Etneo CT 15 3963 76523
Malvagna ME 15 733 77256
Roccalumera ME 15 4141 81397
Fiumefreddo di Sicilia CT 16 9623 91020
Moio Alcantara ME 16 717 91737
Tripi ME 17 873 92610
Fiumedinisi ME 17 1409 94019
Nizza di Sicilia ME 17 3667 97686
Castroreale ME 18 2504 100190
Alì Terme ME 19 2539 102729
Roccella Valdemone ME 19 666 103395
Mazzarrà Sant'Andrea ME 19 1531 104926
Alì ME 20 768 105694
Mascali CT 20 14282 119976

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km N of Acireale (52622 inhabitants)
41 Km SW of Messina (238439 inhabitants)
41 Km SW of Reggio di Calabria (183035 inhabitants)
49 Km N of Catania (314555 inhabitants)
97 Km N of Siracusa (122291 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.3 2021-07-20
21:26:16		 37.9345 15.2272 20 2021-12-29
11:12:50		 Bollettino Sismico Italiano INGV 97215671
Reviewed
Rev100 		ML 1.3 2021-07-20
21:26:16		 37.9723 15.2403 21 2021-07-20
21:36:30		 Sala Sismica INGV-Roma 93000671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-20 21:26:16 ± 0.22
Latitude 37.9345 ± 0.0081
Longitude 15.2272 ± 0.0148
Depth (km) 20 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97215671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 977
Semi-minor axis of confidence ellipse (meter) 958
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 275
Circular confidence region, given by single value of horizontal uncertainty (meter) 980.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 151
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.03687
Epicentral distance of station farthest from the epicenter (degree) 0.97756
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 93000671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-20 21:36:30

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 97215671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-03 20:44:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2021-07-20T21:26:38.07 0.6 undecidable manual S 206 72.0723 99 -0.34 42
IV.HAVL.HHZ. 2021-07-20T21:26:34.04 0.3 undecidable manual P 185 108.5136 95 -0.7 52
IV.HLNI.HHZ. 2021-07-20T21:26:28.58 0.3 undecidable manual P 206 72.0723 99 -0.58 59
IV.MUCR.HHZ. 2021-07-20T21:26:28.22 0.6 undecidable manual S 291 33.1446 113 -0.12 48
IV.MCPD.HHE. 2021-07-20T21:26:25.54 0.6 undecidable manual P 296 48.0186 104 0.02 48
IV.MSRU.HHE. 2021-07-20T21:26:25.24 0.3 undecidable manual P 34 44.0226 106 0.31 68
IV.ECTS.HHZ. 2021-07-20T21:26:23.50 0.6 undecidable manual S 238 10.9779 147 -0.16 50
IV.MUCR.HHZ. 2021-07-20T21:26:23.20 0.1 undecidable manual P 291 33.1446 113 -0.14 95
IV.NOV.HHZ. 2021-07-20T21:26:23.87 0.3 undecidable manual S 323 13.0758 142 -0.11 75
IV.EPZF.HHZ. 2021-07-20T21:26:23.91 0.3 undecidable manual P 249 34.6431 111 0.35 68
IV.EMNR.HHZ. 2021-07-20T21:26:22.37 0.3 undecidable manual P 234 21.9669 125 0.54 66
IV.EMSG.HHZ. 2021-07-20T21:26:22.93 0.3 undecidable manual P 243 27.3504 118 0.39 68
IV.ECBD.HHN. 2021-07-20T21:26:22.50 0.3 undecidable manual P 216 21.0678 126 0.78 61
IV.AIO.HHZ. 2021-07-20T21:26:22.82 0.3 undecidable manual S 7 4.0959 167 -0.11 76
IV.EFIU.HHZ. 2021-07-20T21:26:21.53 0.3 undecidable manual P 185 16.1727 135 0.39 70
IV.AIO.HHZ. 2021-07-20T21:26:20.08 0.1 undecidable manual P 7 4.0959 167 -0.15 100
IV.ECTS.HHZ. 2021-07-20T21:26:20.41 0.1 undecidable manual P 238 10.9779 147 -0.23 97
IV.NOV.HHZ. 2021-07-20T21:26:20.68 0.1 undecidable manual P 323 13.0758 142 -0.14 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.AIO.HHE. ML:1.3 0.000158 1.84 AML other m 2021-07-20T21:26:22.98
IV.AIO.HHN. ML:1.1 0.00009900000000000001 0.76 AML other m 2021-07-20T21:26:23.09
IV.ECTS.HHE. ML:0.9 0.00006135 1.3 AML other m 2021-07-20T21:26:23.25
IV.NOV.HHE. ML:1.7 0.0003695 0.36 AML other m 2021-07-20T21:26:24.07
IV.NOV.HHN. ML:1.7 0.000306 0.52 AML other m 2021-07-20T21:26:24.42
IV.ECTS.HHN. ML:1.3 0.00014000000000000001 0.16 AML other m 2021-07-20T21:26:25.35
IV.MUCR.HHN. ML:1.2 0.00005629999999999999 1.74 AML other m 2021-07-20T21:26:28.06
IV.MUCR.HHE. ML:1.1 0.000045199999999999994 0.62 AML other m 2021-07-20T21:26:28.93
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download