Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 21-04-2023 and time 15:44:21 (UTC) in region 2 km NE Ragalna (CT)

A magnitude ML 1.9 earthquake occured in region: 2 km NE Ragalna (CT), on

  • 21-04-2023 15:44:21 (UTC)
  • 21-04-2023 17:44:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.6460, 14.9500 at 6 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.

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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 6 7641 11565
Belpasso CT 7 28108 39673
Biancavilla CT 7 24007 63680
Nicolosi CT 8 7463 71143
Paternò CT 9 48228 119371
Camporotondo Etneo CT 10 5023 124394
Pedara CT 10 14102 138496
Adrano CT 10 36122 174618
San Pietro Clarenza CT 10 7743 182361
Trecastagni CT 12 10910 193271
Mascalucia CT 12 31958 225229
Tremestieri Etneo CT 13 20589 245818
Viagrande CT 14 8563 254381
Gravina di Catania CT 14 25838 280219
Zafferana Etnea CT 15 9517 289736
Misterbianco CT 15 49410 339146
San Giovanni la Punta CT 15 23060 362206
Motta Sant'Anastasia CT 15 12116 374322
Aci Bonaccorsi CT 15 3524 377846
Sant'Agata li Battiati CT 15 9479 387325
Aci Sant'Antonio CT 16 17984 405309
San Gregorio di Catania CT 17 11966 417275
Milo CT 17 1087 418362
Valverde CT 17 7840 426202
Santa Venerina CT 17 8592 434794
Aci Catena CT 18 29851 464645
Centuripe EN 19 5470 470115
Bronte CT 19 19172 489287
Acireale CT 19 52622 541909
Catania CT 20 314555 856464
Aci Castello CT 20 18723 875187

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km W of Acireale (52622 inhabitants)
20 Km NW of Catania (314555 inhabitants)
72 Km NW of Siracusa (122291 inhabitants)
80 Km SW of Reggio di Calabria (183035 inhabitants)
80 Km E of Caltanissetta (63360 inhabitants)
81 Km SW of Messina (238439 inhabitants)
82 Km N of Ragusa (73313 inhabitants)
86 Km NE of Vittoria (63339 inhabitants)
89 Km N of Modica (54633 inhabitants)
89 Km NE of Gela (75827 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 1.9 2023-04-21
15:44:21		 37.6463 14.9502 7 2024-03-01
17:18:20		 Bollettino Sismico Italiano INGV 125074191
Reviewed
Rev200 		ML 1.2 2023-04-21
15:44:20		 37.667 14.944 4 2024-02-06
14:56:26		 Sala Operativa INGV_OE (Catania) 116575091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-21 15:44:21 ± 0.26
Latitude 37.6463 ± 0.0081
Longitude 14.9502 ± 0.0091
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 125074191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 978
Semi-minor axis of confidence ellipse (meter) 100
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 149
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) 138
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.03597
Epicentral distance of station farthest from the epicenter (degree) 0.17447
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 125074191
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-06 14:56:11

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 116575091
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2023-04-21 15:49:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EMSG.HHZ. 2023-04-21T15:44:25.65 0.3 undecidable manual P 360 19.3695 108 0.46 67
IV.ECZM.HHN. 2023-04-21T15:44:25.74 0.6 undecidable manual S 337 10.2786 122 0.43 46
IV.ESPC.HHN. 2023-04-21T15:44:24.97 0.6 undecidable manual S 53 8.4804 127 0.16 48
IV.ESML.HHZ. 2023-04-21T15:44:24.81 0.6 undecidable manual S 243 6.993 133 0.41 46
IV.ESLN.HHZ. 2023-04-21T15:44:24.03 0.6 undecidable manual S 22 5.5944 139 -0.05 50
IV.ESVO.HHE. 2023-04-21T15:44:24.62 0.3 undecidable manual P 359 14.0748 115 0.42 68
IV.ECHR.HHE. 2023-04-21T15:44:24.11 0.6 undecidable manual S 324 5.4945 139 0.06 50
IV.EMFS.HHZ. 2023-04-21T15:44:23.23 0.3 undecidable manual P 27 9.1797 125 -0.12 73
IV.ECZM.HHN. 2023-04-21T15:44:23.28 0.1 undecidable manual P 337 10.2786 122 -0.25 95
IV.EMPL.HHZ. 2023-04-21T15:44:23.89 0.6 undecidable manual S 26 3.996 148 0.15 49
IV.ESPC.HHN. 2023-04-21T15:44:23.21 0.1 undecidable manual P 53 8.4804 127 -0.03 99
IV.ENIC.HHN. 2023-04-21T15:44:23.27 0.3 undecidable manual P 105 6.4935 135 0.33 70
IV.ECHR.HHE. 2023-04-21T15:44:22.28 0.1 undecidable manual P 324 5.4945 139 -0.52 90
IV.EMPL.HHZ. 2023-04-21T15:44:22.37 0.1 negative manual P 26 3.996 148 -0.26 96
IV.ESML.HHZ. 2023-04-21T15:44:22.99 0.1 negative manual P 243 6.993 133 -0.02 100
IV.ESLN.HHZ. 2023-04-21T15:44:22.52 0.1 undecidable manual P 22 5.5944 139 -0.3 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EMPL.HHE. ML:0.0 0.0067520825 0.2304 AML other m 2023-04-21T15:44:23.98
IV.EMPL.HHN. ML:0.0 0.010588245000000001 0.1792 AML other m 2023-04-21T15:44:24.79
IV.ESML.HNE. ML:0.0 0.0007032672 0.2304 AML other m 2023-04-21T15:44:26.91
IV.ESML.HHE. ML:0.0 0.00068234965 0.2688 AML other m 2023-04-21T15:44:26.19
IV.ESML.HHN. ML:0.0 0.0004977280499999999 0.2432 AML other m 2023-04-21T15:44:28.31
IV.ESML.HNN. ML:0.0 0.000514266 0.2048 AML other m 2023-04-21T15:44:28.31
IV.EMFS.HHN. ML:1.8 0.0010767537 0.2816 AML other m 2023-04-21T15:44:27.17
IV.EMFS.HHE. ML:1.9 0.0013960210000000001 0.4608 AML other m 2023-04-21T15:44:25.34
IV.ENIC.HHE. ML:0.0 0.00069013635 0.1536 AML other m 2023-04-21T15:44:26.51
IV.ENIC.HHN. ML:0.0 0.0007147804 0.1408 AML other m 2023-04-21T15:44:27.44
IV.ESVO.HHE. ML:2.0 0.0011279005 0.5248 AML other m 2023-04-21T15:44:28.05
IV.ESVO.HHN. ML:2.0 0.0012304174999999999 0.4608 AML other m 2023-04-21T15:44:31.55
IV.EMSG.HHE. ML:1.7 0.0003927893 0.4992 AML other m 2023-04-21T15:44:34.30
IV.EMSG.HHN. ML:1.8 0.0004978414 0.4352 AML other m 2023-04-21T15:44:33.52
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