Earthquake with magnitude of ML 1.5 on date 06-08-2021 and time 20:08:33 (UTC) in region 6 km SE Niscemi (CL)

A magnitude ML 1.5 earthquake occured in region: 6 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) 37.106, 14.435 at 30 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Niscemi CL 6 27558 27558
Acate RG 10 10954 38512
Mazzarrone CT 12 4078 42590
Caltagirone CT 16 38686 81276
Gela CL 17 75827 157103
San Michele di Ganzaria CT 20 3245 160348
Vittoria RG 20 63339 223687

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Gela (75827 inhabitants)
20 Km NW of Vittoria (63339 inhabitants)
33 Km NW of Ragusa (73313 inhabitants)
40 Km NW of Modica (54633 inhabitants)
54 Km SE of Caltanissetta (63360 inhabitants)
73 Km SW of Catania (314555 inhabitants)
76 Km W of Siracusa (122291 inhabitants)
79 Km E of Agrigento (59770 inhabitants)
86 Km SW of Acireale (52622 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
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 (http://www.haisentitoilterremoto.it/) 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
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 ± 0.17
Latitude 37.1058 ± 0.0072
Longitude 14.4353 ± 0.0079
Depth (km) 31 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93768251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 682
Semi-minor axis of confidence ellipse (meter) 637
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 312
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.56657
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 10
Magnitude information

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 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.HLNI.HHZ. 2021-08-06T20:08:50.16 1.0 undecidable manual S 55 0.4236 118 0.1 24
IV.HMDC.HHZ. 2021-08-06T20:08:47.39 1.0 undecidable manual S 118 0.3139 127 0.09 24
IV.HVZN.HHZ. 2021-08-06T20:08:45.35 1.0 undecidable manual S 72 0.2347 136 -0.17 24
IV.HAVL.HHZ. 2021-08-06T20:08:45.52 1.0 undecidable manual P 105 0.5666 111 0.13 23
IV.SSY.HHZ. 2021-08-06T20:08:44.98 1.0 positive manual P 84 0.5108 113 0.47 21
IV.RAFF.HHZ. 2021-08-06T20:08:43.92 0.3 undecidable manual S 334 0.1304 152 0.23 73
IV.HVIT.HHZ. 2021-08-06T20:08:43.59 0.6 undecidable manual S 149 0.1322 152 -0.12 50
IV.ACATE.HNZ. 2021-08-06T20:08:43.34 0.6 undecidable manual S 147 0.0971 159 0.06 51
IV.RESU.HHZ. 2021-08-06T20:08:43.84 3.0 undecidable manual S -9.99 0
IV.HLNI.HHZ. 2021-08-06T20:08:42.98 0.3 negative manual P 55 0.4236 118 -0.18 70
IV.CLTA.HHE. 2021-08-06T20:08:42.72 1.0 undecidable manual P 278 0.3804 121 0.21 23
IV.CPTP.HHE. 2021-08-06T20:08:42.09 1.0 undecidable manual P 324 0.3714 122 -0.28 23
IV.HMDC.HHZ. 2021-08-06T20:08:41.91 0.6 positive manual P 118 0.3139 127 0.35 46
IV.HVZN.HHZ. 2021-08-06T20:08:40.55 0.1 positive manual P 72 0.2347 136 0.01 100
IV.RAFF.HHZ. 2021-08-06T20:08:39.09 0.6 undecidable manual P 334 0.1304 152 -0.38 48
IV.HVIT.HHZ. 2021-08-06T20:08:39.36 0.1 negative manual P 149 0.1322 152 -0.13 100
IV.ACATE.HNZ. 2021-08-06T20:08:39.16 1.0 undecidable manual P 147 0.0971 159 -0.08 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HVIT.HHN. ML:1.5 0.000130585875 0.0768 AML other m 2021-08-06T20:08:43.69
IV.HVIT.HHE. ML:1.6 0.00020151875 0.192 AML other m 2021-08-06T20:08:43.76
IV.RAFF.HHE. ML:1.2 7.633334E-5 0.32 AML other m 2021-08-06T20:08:43.92
IV.RAFF.HHN. ML:0.9 3.4494795E-5 0.32 AML other m 2021-08-06T20:08:44.05
IV.HVZN.HNE. ML:1.4 7.7993985E-5 0.5248 AML other m 2021-08-06T20:08:45.81
IV.HVZN.HNN. ML:1.7 0.0001753843 0.2048 AML other m 2021-08-06T20:08:46.11
IV.HVZN.HHE. ML:1.4 8.5955485E-5 0.4992 AML other m 2021-08-06T20:08:45.82
IV.HVZN.HHN. ML:1.4 9.89438615E-5 0.1664 AML other m 2021-08-06T20:08:46.00
IV.HMDC.HHE. ML:1.5 9.9955395E-5 0.0768 AML other m 2021-08-06T20:08:48.29
IV.HMDC.HHN. ML:1.6 0.00012719983 0.1408 AML other m 2021-08-06T20:08:48.24
IV.HMDC.HNE. ML:1.7 0.00014690725 0.4096 AML other m 2021-08-06T20:08:49.80
IV.HMDC.HNN. ML:1.7 0.00014632235 0.2944 AML other m 2021-08-06T20:08:48.39
IV.HLNI.HHE. ML:0.8 1.454637E-5 0.2048 AML other m 2021-08-06T20:08:50.29
IV.HLNI.HHN. ML:0.8 1.36190758E-5 0.3712 AML other m 2021-08-06T20:08:50.26
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 5.7800585E-5 0.2816 AML other m 2021-08-06T20:08:57.57
IV.HAVL.HHN. ML:1.7 8.276523E-5 0.576 AML other m 2021-08-06T20:09:01.79
IV.MCRV.HHE. ML:2.5 1.66606E-5 2.304 AML other m 2021-08-06T20:10:35.71
IV.MCRV.HHN. ML:2.6 2.1553685E-5 1.4592 AML other m 2021-08-06T20:09:48.24
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