Earthquake with magnitude of ML 1.0 on date 08-08-2021 and time 03:01:09 (Italy) in region 3 km NW Melilli (SR)

A magnitude ML 1.0 earthquake occured in region: 3 km NW Melilli (SR), on

  • 08-08-2021 01:01:09 (UTC)
  • 08-08-2021 03:01:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.205, 15.116 at 17 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
Melilli SR 3 13621 13621
Priolo Gargallo SR 8 12091 25712
Sortino SR 9 8690 34402
Augusta SR 10 36305 70707
Solarino SR 11 8091 78798
Carlentini SR 12 17798 96596
Lentini SR 14 24085 120681
Floridia SR 14 22762 143443
Ferla SR 18 2523 145966
Cassaro SR 19 821 146787
Canicattini Bagni SR 19 7109 153896

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NW of Siracusa (122291 inhabitants)
33 Km S of Catania (314555 inhabitants)
46 Km S of Acireale (52622 inhabitants)
46 Km NE of Ragusa (73313 inhabitants)
50 Km NE of Modica (54633 inhabitants)
59 Km NE of Vittoria (63339 inhabitants)
78 Km E of Gela (75827 inhabitants)
99 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 1.0 2021-08-08
01:01:09
37.2048 15.1162 17 2021-08-08
01:11:47
Sala Sismica INGV-Roma 93818671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-08 01:01:09 ± 0.31
Latitude 37.2048 ± 0.0108
Longitude 15.1162 ± 0.0181
Depth (km) 17 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93818671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1303
Semi-minor axis of confidence ellipse (meter) 1028
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 1300
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 158
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.05846
Epicentral distance of station farthest from the epicenter (degree) 0.32016
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 93818671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-08 01:11:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HVZN.HHE. 2021-08-08T01:01:21.88 0.6 undecidable manual S 265 0.3202 105 -0.16 46
IV.HAVL.HHZ. 2021-08-08T01:01:19.61 0.6 undecidable manual S 179 0.2455 111 -0.31 46
IV.HVZN.HHE. 2021-08-08T01:01:17.58 0.3 undecidable manual P 265 0.3202 105 0.68 59
IV.HCRL.HHZ. 2021-08-08T01:01:16.57 0.3 undecidable manual S 320 0.1025 140 0.13 74
IV.HAGA.HHZ. 2021-08-08T01:01:16.33 0.6 undecidable manual S 21 0.0854 146 0.19 49
IV.HAVL.HHZ. 2021-08-08T01:01:15.87 0.6 undecidable manual P 179 0.2455 111 0.19 46
IV.SSY.HHZ. 2021-08-08T01:01:15.75 0.6 undecidable manual S 216 0.0585 156 0.01 50
IV.HLNI.HHZ. 2021-08-08T01:01:15.02 0.3 undecidable manual P 307 0.2419 112 -0.6 63
IV.HAGA.HHZ. 2021-08-08T01:01:13.50 0.1 undecidable manual P 21 0.0854 146 0.01 100
IV.HCRL.HHZ. 2021-08-08T01:01:13.62 0.1 undecidable manual P 320 0.1025 140 -0.05 99
IV.SSY.HHZ. 2021-08-08T01:01:13.19 0.1 negative manual P 216 0.0585 156 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSY.HHE. ML:1 9.995E-5 1.18 AML other m 2021-08-08T01:01:16.87
IV.HAGA.HHE. ML:1 8.245E-5 0.26 AML other m 2021-08-08T01:01:16.42
IV.HCRL.HHE. ML:1 8.125E-5 0.3 AML other m 2021-08-08T01:01:16.70
IV.HAGA.HHN. ML:0.8 5.23E-5 1.02 AML other m 2021-08-08T01:01:17.78
IV.HCRL.HHN. ML:0.8 4.9E-5 0.14 AML other m 2021-08-08T01:01:17.53
IV.SSY.HHN. ML:1.2 0.000163 0.7 AML other m 2021-08-08T01:01:17.26
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