Earthquake with magnitude of ML 1.2 on date 23-08-2021 and time 04:50:16 (Italy) in region 6 km S Militello in Val di Catania (CT)

A magnitude ML 1.2 earthquake occured in region: 6 km S Militello in Val di Catania (CT), on

  • 23-08-2021 02:50:16 (UTC)
  • 23-08-2021 04:50:16 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.223, 14.788 at 19 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
Militello in Val di Catania CT 6 7443 7443
Vizzini CT 8 6241 13684
Francofonte SR 8 12800 26484
Mineo CT 10 5159 31643
Scordia CT 10 17095 48738
Licodia Eubea CT 11 3081 51819
Buccheri SR 12 1999 53818
Palagonia CT 12 16608 70426
Grammichele CT 13 13418 83844
Monterosso Almo RG 15 3032 86876
Buscemi SR 18 1051 87927
Ferla SR 18 2523 90450
Cassaro SR 19 821 91271
Giarratana RG 19 3048 94319
Ramacca CT 20 10894 105213

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km N of Ragusa (73313 inhabitants)
38 Km NE of Vittoria (63339 inhabitants)
41 Km N of Modica (54633 inhabitants)
41 Km SW of Catania (314555 inhabitants)
48 Km W of Siracusa (122291 inhabitants)
51 Km E of Gela (75827 inhabitants)
55 Km SW of Acireale (52622 inhabitants)
71 Km E of Caltanissetta (63360 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 1.2 2021-08-23
02:50:16
37.2232 14.7882 19 2021-08-23
03:06:34
Sala Sismica INGV-Roma 94522181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-23 02:50:16 ± 0.14
Latitude 37.2232 ± 0.0045
Longitude 14.7882 ± 0.0056
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94522181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 590
Semi-minor axis of confidence ellipse (meter) 208
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 141
Circular confidence region, given by single value of horizontal uncertainty (meter) 590
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 118
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.07285
Epicentral distance of station farthest from the epicenter (degree) 0.37412
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 94522181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-23 03:06:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2021-08-23T02:50:30.16 0.6 undecidable manual S 135 0.3741 105 0.2 47
IV.HVIT.HHE. 2021-08-23T02:50:28.35 0.6 undecidable manual S 223 0.313 109 0.13 48
IV.HAGA.HHZ. 2021-08-23T02:50:27.86 0.3 undecidable manual S 78 0.2986 110 0.06 74
IV.SSY.HHZ. 2021-08-23T02:50:26.44 0.3 undecidable manual S 106 0.2365 116 0.32 71
IV.HMDC.HHZ. 2021-08-23T02:50:26.72 0.3 undecidable manual S 181 0.2644 113 -0.14 73
IV.HCRL.HHZ. 2021-08-23T02:50:25.50 0.3 undecidable manual S 73 0.2032 121 0.25 72
IV.RAFF.HHE. 2021-08-23T02:50:23.93 0.6 undecidable manual P 270 0.339 107 0.4 45
IV.HLNI.HHZ. 2021-08-23T02:50:23.73 0.3 undecidable manual S 28 0.1421 133 -0.06 77
IV.HAVL.HHZ. 2021-08-23T02:50:23.76 0.6 undecidable manual P 135 0.3741 105 -0.36 45
IV.HVIT.HHE. 2021-08-23T02:50:23.42 0.6 undecidable manual P 223 0.313 109 0.31 46
IV.HAGA.HHZ. 2021-08-23T02:50:22.62 0.6 undecidable manual P 78 0.2986 110 -0.25 47
IV.HVZN.HHZ. 2021-08-23T02:50:22.29 0.3 undecidable manual S 232 0.0728 153 -0.26 74
IV.HMDC.HHZ. 2021-08-23T02:50:22.07 0.3 undecidable manual P 181 0.2644 113 -0.25 71
IV.HCRL.HHZ. 2021-08-23T02:50:21.32 0.1 positive manual P 73 0.2032 121 -0.08 99
IV.SSY.HHZ. 2021-08-23T02:50:21.87 0.3 undecidable manual P 106 0.2365 116 -0.03 75
IV.HVZN.HHZ. 2021-08-23T02:50:20.00 0.3 undecidable manual P 232 0.0728 153 0.16 75
IV.HLNI.HHZ. 2021-08-23T02:50:20.42 0.1 undecidable manual P 28 0.1421 133 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHN. ML:0.8 3.24332E-5 2 AML other m 2021-08-23T02:50:22.59
IV.HMDC.HHE. ML:1 4.0066455E-5 1.7408 AML other m 2021-08-23T02:50:31.19
IV.HCRL.HHE. ML:0.9 4.741977E-5 0.2016 AML other m 2021-08-23T02:50:25.71
IV.HCRL.HHN. ML:1 5.1501245E-5 0.1408 AML other m 2021-08-23T02:50:25.70
IV.SSY.HHE. ML:1.4 0.00010740431 2.56 AML other m 2021-08-23T02:50:26.72
IV.SSY.HHN. ML:1.6 0.00016532975 0.4992 AML other m 2021-08-23T02:50:30.14
IV.HMDC.HNE. ML:1.4 0.00012064595 3 AML other m 2021-08-23T02:50:23.47
IV.HMDC.HNN. ML:1.6 0.00018135935 2.4192 AML other m 2021-08-23T02:50:25.64
IV.HAGA.HHE. ML:1.2 5.42841E-5 1.08 AML other m 2021-08-23T02:50:22.66
IV.HAGA.HHN. ML:1.2 5.750541E-5 1.4992 AML other m 2021-08-23T02:50:26.32
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