Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 06-08-2021 and time 20:08:33 (UTC) in region 5 km SE Niscemi (CL)

A magnitude ML 1.5 earthquake occured in region: 5 km SE Niscemi (CL), on

  • 06-08-2021 20:08:33 (UTC)
  • 06-08-2021 22:08:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.1150, 14.4310 at 30 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
Niscemi CL 5 27558 27558
Acate RG 11 10954 38512
Mazzarrone CT 12 4078 42590
Caltagirone CT 16 38686 81276
Gela CL 17 75827 157103
San Michele di Ganzaria CT 18 3245 160348

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Gela (75827 inhabitants)
21 Km NW of Vittoria (63339 inhabitants)
34 Km NW of Ragusa (73313 inhabitants)
41 Km NW of Modica (54633 inhabitants)
53 Km SE of Caltanissetta (63360 inhabitants)
72 Km SW of Catania (314555 inhabitants)
77 Km W of Siracusa (122291 inhabitants)
78 Km E of Agrigento (59770 inhabitants)
85 Km SW of Acireale (52622 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 1.5 2021-08-06
20:08:33		 37.1148 14.4313 30 2021-12-29
11:12:24		 Bollettino Sismico Italiano INGV 94905711
Reviewed
Rev100 		ML 1.5 2021-08-06
20:08:33		 37.1058 14.4353 31 2021-08-06
20:19:07		 Sala Sismica INGV-Roma 93768251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-06 20:08:33 ± 0.24
Latitude 37.1148 ± 0.0099
Longitude 14.4313 ± 0.0113
Depth (km) 30 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94905711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1083
Semi-minor axis of confidence ellipse (meter) 732
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 314
Circular confidence region, given by single value of horizontal uncertainty (meter) 1080.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57197
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 94905711
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-01 08:36:16

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 93768251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-06 20:19:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.OSSC.HHZ. 2021-08-06T20:10:24.27 3.0 undecidable manual Pg 9.12 0
IT.MTCL.HGZ. 2021-08-06T20:10:12.91 3.0 undecidable manual Pg 9.87 0
IV.OFFI.HHZ. 2021-08-06T20:10:08.83 3.0 undecidable manual Pg 7.65 0
IV.FDMO.HHZ. 2021-08-06T20:10:06.68 3.0 negative manual Pg 3.23 0
IV.AGLI.HHZ. 2021-08-06T20:10:02.20 3.0 positive manual Pg 2.14 0
IV.FAGN.HHZ. 2021-08-06T20:10:01.31 3.0 positive manual Pg 9.11 0
IV.MMUR.HNZ. 2021-08-06T20:10:00.03 3.0 undecidable manual Pn -9.05 0
IV.LADO.EHZ. 2021-08-06T20:09:58.10 3.0 undecidable manual Sn 0.48 0
MN.TIP.HHZ. 2021-08-06T20:09:58.91 3.0 undecidable manual Sg 6.03 0
IV.SPS2.HHZ. 2021-08-06T20:09:51.24 3.0 undecidable manual Sg 1.28 0
IV.TOLF.HHZ. 2021-08-06T20:09:41.39 3.0 undecidable manual Pn -9.99 0
IV.MCRV.HHZ. 2021-08-06T20:09:33.13 3.0 undecidable manual Pg 1.32 0
IV.EFIU.HHZ. 2021-08-06T20:09:03.74 3.0 undecidable manual S -2.31 0
IV.HMDC.HHZ. 2021-08-06T20:08:47.73 0.3 undecidable manual S 119 35.6421 125 0.28 71
IV.SSY.HHZ. 2021-08-06T20:08:45.08 0.3 undecidable manual P 85 56.9985 112 0.47 65
IV.HAVL.HHZ. 2021-08-06T20:08:45.76 0.6 undecidable manual P 106 63.492 110 0.21 45
IV.HVZN.HHZ. 2021-08-06T20:08:45.36 0.3 undecidable manual S 74 26.0517 135 -0.13 74
IV.RAFF.HHZ. 2021-08-06T20:08:43.92 0.3 undecidable manual S 333 13.3755 153 0.44 70
IV.ACATE.HNZ. 2021-08-06T20:08:43.34 0.6 undecidable manual S 149 11.7771 156 0.04 51
IV.RESU.HHZ. 2021-08-06T20:08:43.84 3.0 undecidable manual S -9.99 0
IV.HVIT.HHZ. 2021-08-06T20:08:43.59 0.6 undecidable manual S 150 15.7731 149 -0.19 49
IV.HLNI.HHZ. 2021-08-06T20:08:42.93 0.1 undecidable manual P 56 46.7199 117 -0.24 92
IV.CLTA.HHE. 2021-08-06T20:08:42.70 0.3 undecidable manual P 277 41.8248 120 0.21 71
IV.CPTP.HHE. 2021-08-06T20:08:42.09 3.0 undecidable manual P -0.28 0
IV.HMDC.HHZ. 2021-08-06T20:08:41.84 0.3 undecidable manual P 119 35.6421 125 0.15 72
IV.HVZN.HHZ. 2021-08-06T20:08:40.53 0.1 positive manual P 74 26.0517 135 -0.03 100
IV.HVIT.HHZ. 2021-08-06T20:08:39.36 0.1 negative manual P 150 15.7731 149 -0.22 98
IV.RAFF.HHZ. 2021-08-06T20:08:39.10 0.1 positive manual P 333 13.3755 153 -0.3 97
IV.ACATE.HNZ. 2021-08-06T20:08:39.03 0.3 undecidable manual P 149 11.7771 156 -0.27 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HVIT.HHN. ML:1.5 0.00013058587499999998 0.0768 AML other m 2021-08-06T20:08:43.69
IV.HVIT.HHE. ML:1.6 0.00020151875000000002 0.192 AML other m 2021-08-06T20:08:43.76
IV.RAFF.HHN. ML:0.9 0.000034494795 1.68 AML other m 2021-08-06T20:08:44.05
IV.RAFF.HHE. ML:1.2 0.00007633334 1.68 AML other m 2021-08-06T20:08:44.92
IV.HVZN.HHN. ML:1.4 0.0000989438615 1.8336 AML other m 2021-08-06T20:08:46.00
IV.HVZN.HNN. ML:1.7 0.0001753843 0.2048 AML other m 2021-08-06T20:08:46.11
IV.HVZN.HNE. ML:1.3 0.000077993985 1.4752 AML other m 2021-08-06T20:08:46.81
IV.HVZN.HHE. ML:1.4 0.000085955485 1.5008 AML other m 2021-08-06T20:08:46.82
IV.HMDC.HHN. ML:1.6 0.00012719982999999998 0.1408 AML other m 2021-08-06T20:08:48.24
IV.HMDC.HNN. ML:1.7 0.00014632234999999998 0.2944 AML other m 2021-08-06T20:08:48.39
IV.HMDC.HHE. ML:1.5 0.00009995539500000001 0.0768 AML other m 2021-08-06T20:08:48.29
IV.HMDC.HNE. ML:1.7 0.00014690725 1.5904 AML other m 2021-08-06T20:08:49.80
IV.HLNI.HHN. ML:0.8 0.0000136190758 0.3712 AML other m 2021-08-06T20:08:50.26
IV.HLNI.HHE. ML:0.8 0.00001454637 0.2048 AML other m 2021-08-06T20:08:50.29
IV.SSY.HHE. ML:1.8 0.000121044945 0.576 AML other m 2021-08-06T20:08:53.27
IV.HAVL.HHE. ML:1.6 0.000057800585 0.2816 AML other m 2021-08-06T20:08:57.57
IV.HAVL.HHN. ML:1.7 0.00008276523 1.424 AML other m 2021-08-06T20:09:01.79
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