Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 21-03-2020 and time 09:23:40 (UTC) in region 3 km NW Sperlinga (EN)

A magnitude ML 1.8 earthquake occured in region: 3 km NW Sperlinga (EN), on

  • 21-03-2020 09:23:40 (UTC)
  • 21-03-2020 10:23:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7840, 14.3230 at 66 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
Sperlinga EN 3 805 805
Nicosia EN 8 13899 14704
Gangi PA 10 6811 21515
Castel di Lucio ME 12 1294 22809
Capizzi ME 16 3176 25985
Cerami EN 16 2006 27991
Mistretta ME 17 4791 32782
Geraci Siculo PA 17 1945 34727
Leonforte EN 17 13439 48166
Nissoria EN 18 3000 51166
San Mauro Castelverde PA 19 1701 52867
Petralia Soprana PA 19 3360 56227
Assoro EN 19 5191 61418

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km NE of Caltanissetta (63360 inhabitants)
74 Km W of Catania (314555 inhabitants)
77 Km W of Acireale (52622 inhabitants)
78 Km E of Bagheria (55387 inhabitants)
80 Km N of Gela (75827 inhabitants)
84 Km NE of Agrigento (59770 inhabitants)
92 Km E of Palermo (674435 inhabitants)
95 Km N of Vittoria (63339 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 1.8 2020-03-21
09:23:40		 37.7842 14.3233 66 2020-07-18
21:08:29		 Bollettino Sismico Italiano INGV 77699681
Reviewed
Rev100 		ML 2.0 2020-03-21
09:23:41		 37.7762 14.2993 64 2020-03-21
09:32:44		 Sala Sismica INGV-Roma 77432731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-03-21 09:23:40 ± 0.24
Latitude 37.7842 ± 0.0108
Longitude 14.3233 ± 0.0148
Depth (km) 66 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 77699681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1363
Semi-minor axis of confidence ellipse (meter) 359
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
Circular confidence region, given by single value of horizontal uncertainty (meter) 1360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.17177
Epicentral distance of station farthest from the epicenter (degree) 1.28783
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 77432731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-03-21 09:32:44

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 15
Type of magnitude ML
Reference to an origin 77699681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-03-30 10:54:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HVZN.HHZ. 2020-03-21T09:24:06.30 0.6 undecidable manual S 153 75.5688 122 0.04 61
IV.HLNI.HHN. 2020-03-21T09:24:04.30 0.3 undecidable manual S 135 68.2761 126 -0.66 79
IV.MUCR.HHZ. 2020-03-21T09:24:03.80 0.3 undecidable manual S 59 56.0994 132 0.88 77
IV.RAFF.HHN. 2020-03-21T09:24:03.90 0.6 undecidable manual S 177 62.3931 129 -0.05 63
IV.USI.HHZ. 2020-03-21T09:24:02.39 0.3 undecidable manual P 316 142.9458 105 -0.83 65
IV.ALJA.HHE. 2020-03-21T09:24:02.90 0.6 undecidable manual S 266 50.1165 136 0.9 48
IV.GALF.HHZ. 2020-03-21T09:23:59.30 0.6 undecidable manual S 111 22.8549 158 0.55 61
MN.VAE.HHE. 2020-03-21T09:23:59.50 0.3 undecidable manual S 176 35.0427 147 -0.48 91
IV.GIB.HHN. 2020-03-21T09:23:59.60 0.6 undecidable manual S 311 34.6431 147 -0.33 63
IV.PETRA.HHZ. 2020-03-21T09:23:59.10 0.6 undecidable manual S 287 19.0698 161 0.63 58
IV.MSFR.HHZ. 2020-03-21T09:23:59.80 0.3 undecidable manual S 40 36.3414 146 -0.33 92
IV.CSLB.HHZ. 2020-03-21T09:23:59.10 0.3 undecidable manual S 306 28.8489 152 -0.2 98
IV.PLLN.EHZ. 2020-03-21T09:23:58.70 0.3 undecidable manual S 326 27.9498 153 -0.52 91
IV.RESU.HHZ. 2020-03-21T09:23:58.90 0.6 undecidable manual S 237 27.9498 153 -0.31 64
IV.SSY.HHZ. 2020-03-21T09:23:57.70 0.3 undecidable manual P 136 95.9262 115 -0.01 89
IV.AIO.HHZ. 2020-03-21T09:23:56.29 0.3 undecidable manual P 75 82.251 120 0.09 91
IV.HAGA.HHZ. 2020-03-21T09:23:56.80 0.3 undecidable manual P 127 91.7415 116 -0.44 82
IV.IACL.HHE. 2020-03-21T09:23:55.47 0.6 undecidable manual P 2 83.1501 119 -0.82 48
IV.HLNI.HHN. 2020-03-21T09:23:54.14 0.3 undecidable manual P 135 68.2761 126 -0.6 82
IV.MUCR.HHZ. 2020-03-21T09:23:54.11 0.3 undecidable manual P 59 56.0994 132 0.55 86
IV.HVZN.HHZ. 2020-03-21T09:23:54.93 0.6 undecidable manual P 153 75.5688 122 -0.56 55
IV.RAFF.HHN. 2020-03-21T09:23:54.44 0.3 undecidable manual P 177 62.3931 129 0.29 90
IV.ALJA.HHE. 2020-03-21T09:23:53.67 0.3 undecidable manual P 266 50.1165 136 0.65 82
MN.VAE.HHE. 2020-03-21T09:23:52.97 0.3 undecidable manual P 176 35.0427 147 1.11 69
IV.PLLN.EHZ. 2020-03-21T09:23:51.74 0.3 undecidable manual P 326 27.9498 153 0.32 95
IV.CAGR.HHE. 2020-03-21T09:23:51.17 0.6 undecidable manual P 139 23.754 157 -0.03 68
IV.GALF.HHZ. 2020-03-21T09:23:51.60 0.6 undecidable manual P 111 22.8549 158 0.45 62
IV.GIB.HHN. 2020-03-21T09:23:51.72 0.3 undecidable manual P 311 34.6431 147 -0.11 98
IV.PETRA.HHZ. 2020-03-21T09:23:51.26 0.3 undecidable manual P 287 19.0698 161 0.27 97
IV.MSFR.HHZ. 2020-03-21T09:23:51.97 0.3 undecidable manual P 40 36.3414 146 0.02 100
IV.CSLB.HHZ. 2020-03-21T09:23:51.64 0.3 undecidable manual P 306 28.8489 152 0.17 98
IV.RESU.HHZ. 2020-03-21T09:23:50.69 0.6 undecidable manual P 237 27.9498 153 -0.73 56
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GALF.HHN. ML:2.2 0.00026910145 0.3008 AML other m 2020-03-21T09:24:01.43
IV.GALF.HHE. ML:2.1 0.00021696484999999998 0.2816 AML other m 2020-03-21T09:24:01.54
IV.CSLB.HHN. ML:1.6 0.000072138765 0.3008 AML other m 2020-03-21T09:24:00.11
IV.CSLB.HHE. ML:1.7 0.000079048885 0.32 AML other m 2020-03-21T09:23:59.99
IV.PLLN.EHE. ML:2.2 0.00024796145 0.3776 AML other m 2020-03-21T09:24:01.13
IV.PLLN.EHN. ML:2.1 0.00022149455 0.7232 AML other m 2020-03-21T09:24:00.32
IV.MSFR.HHN. ML:1.3 0.000030611465 0.5632 AML other m 2020-03-21T09:24:02.95
IV.MSFR.HHE. ML:1.2 0.0000260981635 0.2048 AML other m 2020-03-21T09:24:01.77
IV.MUCR.HHE. ML:1.9 0.00009278503 0.2752 AML other m 2020-03-21T09:24:05.11
IV.MUCR.HHN. ML:1.8 0.00007946085 0.5824 AML other m 2020-03-21T09:24:06.25
IV.AIO.HHE. ML:1.6 0.000036015850000000005 0.3776 AML other m 2020-03-21T09:24:08.17
IV.HAGA.HHE. ML:1.6 0.000028617234999999997 0.0768 AML other m 2020-03-21T09:24:08.36
IV.HAGA.HHN. ML:1.6 0.00002850651 0.1216 AML other m 2020-03-21T09:24:08.41
IV.SSY.HHN. ML:2.8 0.0004965432 0.1792 AML other m 2020-03-21T09:24:13.19
IV.USI.HHN. ML:2.3 0.000098284915 0.2432 AML other m 2020-03-21T09:24:19.40
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
Waveforms Seismic signals in miniseed + resp format Download