Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 28-08-2021 and time 04:45:02 (UTC) in region Costa Siracusana (Siracusa)

A magnitude ML 1.8 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 28-08-2021 04:45:02 (UTC)
  • 28-08-2021 06:45:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.8500, 15.1140 at 24 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
Noto SR 6 23913 23913
Avola SR 7 31708 55621
Rosolini SR 15 21427 77048
Pachino SR 15 22205 99253
Portopalo di Capo Passero SR 19 3887 103140
Ispica RG 20 16061 119201

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Siracusa (122291 inhabitants)
31 Km E of Modica (54633 inhabitants)
35 Km E of Ragusa (73313 inhabitants)
52 Km E of Vittoria (63339 inhabitants)
73 Km S of Catania (314555 inhabitants)
80 Km E of Gela (75827 inhabitants)
85 Km S 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 1.8 2021-08-28
04:45:02		 36.8498 15.1143 24 2021-12-29
11:12:33		 Bollettino Sismico Italiano INGV 95974181
Reviewed
Rev100 		ML 2.0 2021-08-28
04:45:02		 36.8385 15.1428 24 2021-08-28
04:49:32		 Sala Sismica INGV-Roma 94732471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-28 04:45:02 ± 0.18
Latitude 36.8498 ± 0.0072
Longitude 15.1143 ± 0.0090
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95974181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 665
Semi-minor axis of confidence ellipse (meter) 638
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 138
Circular confidence region, given by single value of horizontal uncertainty (meter) 670.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 185
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53420
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 21
Type of magnitude ML
Reference to an origin 95974181
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-04 18:46:13

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 94732471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-28 04:49:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EPZF.HHZ. 2021-08-28T04:45:19.23 3.0 undecidable manual P -0.3 0
IV.HMDC.HHZ. 2021-08-28T04:45:14.93 0.3 undecidable manual S 293 31.746 120 0.39 67
IV.HLNI.HHZ. 2021-08-28T04:45:13.20 0.3 undecidable manual P 339 59.2962 105 -0.27 66
IV.HSRS.HHZ. 2021-08-28T04:45:13.74 0.3 undecidable manual S 19 28.5492 123 -0.08 73
IV.HVZN.HHZ. 2021-08-28T04:45:12.49 0.6 undecidable manual P 316 50.7159 108 0.29 45
IV.HVIT.HHZ. 2021-08-28T04:45:12.60 0.6 undecidable manual P 287 54.9006 106 -0.21 45
IV.HPAC.HHZ. 2021-08-28T04:45:11.46 0.3 undecidable manual S 204 17.0718 140 -0.04 75
IV.HAGA.HHZ. 2021-08-28T04:45:11.61 0.3 undecidable manual P 4 48.4182 109 -0.25 68
IV.ISPIC.EHZ. 2021-08-28T04:45:11.58 0.3 undecidable manual S 248 20.2686 134 -0.5 68
IV.HCRL.HHZ. 2021-08-28T04:45:11.94 0.1 negative manual P 351 48.618 109 0.06 95
IV.SSY.HHZ. 2021-08-28T04:45:10.03 0.6 positive manual P 354 34.3434 118 0.17 48
IV.HAVL.HHZ. 2021-08-28T04:45:10.89 0.3 undecidable manual S 3 12.1767 149 0.15 74
IV.HMDC.HHZ. 2021-08-28T04:45:09.58 0.3 undecidable manual P 293 31.746 120 0.07 73
IV.ISPIC.EHZ. 2021-08-28T04:45:08.17 0.1 undecidable manual P 248 20.2686 134 0.08 99
IV.HSRS.HHZ. 2021-08-28T04:45:08.99 0.1 undecidable manual P 19 28.5492 123 -0.1 96
IV.HAVL.HHZ. 2021-08-28T04:45:07.43 0.1 positive manual P 3 12.1767 149 0.11 100
IV.HPAC.HHZ. 2021-08-28T04:45:07.93 0.1 undecidable manual P 204 17.0718 140 0.17 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HAVL.HHE. ML:1.9 0.0005055000000000001 0.16 AML other m 2021-08-28T04:45:11.39
IV.HAVL.HHN. ML:1.9 0.00046030990000000004 0.16 AML other m 2021-08-28T04:45:11.64
IV.HPAC.HHN. ML:1.7 0.00023874105 0.0992 AML other m 2021-08-28T04:45:12.04
IV.HPAC.HHE. ML:1.8 0.000333731 0.1984 AML other m 2021-08-28T04:45:12.08
IV.ISPIC.HNN. ML:2.2 0.0007059999999999999 0.1 AML other m 2021-08-28T04:45:12.41
IV.ISPIC.EHN. ML:2.1 0.000669 0.1 AML other m 2021-08-28T04:45:12.42
IV.ISPIC.EHE. ML:2.0 0.0005085846 0.1408 AML other m 2021-08-28T04:45:12.39
IV.ISPIC.HNE. ML:2.0 0.0005200494 0.1504 AML other m 2021-08-28T04:45:12.38
IV.HSRS.HHE. ML:1.6 0.00015572029999999997 0.0608 AML other m 2021-08-28T04:45:13.93
IV.HSRS.HHN. ML:1.7 0.00020357419999999997 0.1184 AML other m 2021-08-28T04:45:13.00
IV.HMDC.HHE. ML:1.5 0.00010519112 0.1408 AML other m 2021-08-28T04:45:15.39
IV.HMDC.HHN. ML:1.6 0.00012995968000000001 0.0992 AML other m 2021-08-28T04:45:16.75
IV.SSY.HHE. ML:2.0 0.00030469290000000005 0.1792 AML other m 2021-08-28T04:45:17.13
IV.SSY.HHN. ML:2.3 0.00067623535 0.1216 AML other m 2021-08-28T04:45:17.73
IV.HAGA.HHE. ML:1.4 0.000055636129999999996 0.1792 AML other m 2021-08-28T04:45:18.71
IV.HCRL.HHE. ML:2.4 0.0006225 0.14 AML other m 2021-08-28T04:45:19.29
IV.HCRL.HHN. ML:1.8 0.00016999999999999999 0.14 AML other m 2021-08-28T04:45:19.92
IV.HAGA.HHN. ML:1.3 0.0000456931 0.0992 AML other m 2021-08-28T04:45:20.01
IV.HVIT.HHE. ML:1.8 0.00013319034 0.1184 AML other m 2021-08-28T04:45:21.60
IV.HVIT.HHN. ML:1.6 0.00008842046 0.1408 AML other m 2021-08-28T04:45:22.33
IV.HVZN.HHN. ML:1.4 0.000057849965 0.3008 AML other m 2021-08-28T04:45:22.68
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
Waveforms Seismic signals in miniseed + resp format Download