Earthquake with magnitude of ML 0.9 on date 21-10-2020 and time 02:34:07 (UTC) in region Costa Siracusana (Siracusa)

A magnitude ML 0.9 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 21-10-2020 02:34:07 (UTC)
  • 21-10-2020 04:34:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.22, 15.21 at 21 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
Augusta SR 2 36305 36305
Priolo Gargallo SR 6 12091 48396
Melilli SR 8 13621 62017
Solarino SR 15 8091 70108
Floridia SR 16 22762 92870
Sortino SR 17 8690 101560
Carlentini SR 19 17798 119358
Siracusa SR 19 122291 241649

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NW of Siracusa (122291 inhabitants)
34 Km SE of Catania (314555 inhabitants)
45 Km S of Acireale (52622 inhabitants)
53 Km NE of Ragusa (73313 inhabitants)
56 Km NE of Modica (54633 inhabitants)
66 Km E of Vittoria (63339 inhabitants)
87 Km E of Gela (75827 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 0.9 2020-10-21
02:34:07
37.21 15.21 21 2020-10-21
02:45:03
Sala Sismica INGV-Roma 83974121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-21 02:34:07 ± 0.24
Latitude 37.21 ± 0.01
Longitude 15.21 ± 0.01
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83974121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 857
Semi-minor axis of confidence ellipse (meter) 451
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 860
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 177
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.30037
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 83974121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-21 02:45:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSNT.HHZ. 2020-10-21T02:35:39.95 1.0 undecidable manual Pg 16.65 0
IV.HLNI.HHZ. 2020-10-21T02:34:19.57 0.3 undecidable manual S 297 0.3004 113 -0.25 70
IV.HAVL.HHZ. 2020-10-21T02:34:18.83 0.3 undecidable manual S 195 0.2644 117 -0.03 72
IV.HCRL.HHZ. 2020-10-21T02:34:16.54 0.6 undecidable manual S 296 0.1574 134 0.29 47
IV.SSY.HHZ. 2020-10-21T02:34:15.51 0.3 undecidable manual S 242 0.1223 142 -0.05 74
IV.HAGA.HHZ. 2020-10-21T02:34:15.00 0.3 undecidable manual S 328 0.0827 153 0.08 75
IV.AGST.EHZ. 2020-10-21T02:34:14.49 0.3 undecidable manual S 18 0.0441 165 -0.01 76
IV.HAVL.HHZ. 2020-10-21T02:34:14.18 1.0 negative manual P 195 0.2644 117 -0.05 24
IV.HLNI.HHZ. 2020-10-21T02:34:14.86 0.3 undecidable manual P 297 0.3004 113 0.08 71
IV.HCRL.HHZ. 2020-10-21T02:34:13.00 1.0 positive manual P 296 0.1574 134 0.28 23
IV.SSY.HHZ. 2020-10-21T02:34:12.51 0.6 undecidable manual P 242 0.1223 142 0.19 49
IV.HAGA.HHZ. 2020-10-21T02:34:11.42 0.6 positive manual P 328 0.0827 153 -0.54 45
IV.AGST.EHZ. 2020-10-21T02:34:11.80 0.1 undecidable manual P 18 0.0441 165 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAGA.HHE. ML:0.1 1.2457826E-5 0.08 AML other m 2020-10-21T02:34:15.21
IV.HAGA.HHN. ML:0.6 3.170487E-5 0.0608 AML other m 2020-10-21T02:34:15.67
IV.AGST.EHE. ML:1.1 9.332708E-5 1.1408 AML other m 2020-10-21T02:34:31.11
IV.AGST.EHN. ML:0.8 5.1976615E-5 0.1184 AML other m 2020-10-21T02:34:14.66
IV.SSY.HHE. ML:1.1 8.564163E-5 0.1808 AML other m 2020-10-21T02:34:15.70
IV.SSY.HHN. ML:1.4 0.0001714437855 0.1008 AML other m 2020-10-21T02:34:16.57
IV.HAVL.HHE. ML:0.9 3.1791624E-5 0.0992 AML other m 2020-10-21T02:34:19.04
IV.HAVL.HHN. ML:1 4.3495715E-5 0.2 AML other m 2020-10-21T02:34:19.20
IV.HLNI.HHE. ML:0.6 1.4720979E-5 0.0992 AML other m 2020-10-21T02:34:20.53
IV.HLNI.HHN. ML:0.7 1.79204025E-5 0.0784 AML other m 2020-10-21T02:34:20.19
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download