Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 07-07-2021 and time 09:49:39 (Italy) in region Costa Siracusana (Siracusa)

A magnitude ML 2.0 earthquake occured in region: Costa Siracusana (Siracusa), on

  • 07-07-2021 07:49:39 (UTC)
  • 07-07-2021 09:49:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.0320, 15.3600 at 31 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
Siracusa SR 7 122291 122291
Floridia SR 19 22762 145053

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km SE of Siracusa (122291 inhabitants)
57 Km E of Modica (54633 inhabitants)
57 Km E of Ragusa (73313 inhabitants)
58 Km SE of Catania (314555 inhabitants)
67 Km S of Acireale (52622 inhabitants)
74 Km E of Vittoria (63339 inhabitants)
99 Km E of Gela (75827 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 2.0 2021-07-07
07:49:39		 37.0325 15.3605 31 2021-12-29
11:12:16		 Bollettino Sismico Italiano INGV 93553211
Reviewed
Rev100 		ML 2.1 2021-07-07
07:49:39		 37.0187 15.3917 26 2021-07-07
07:53:27		 Sala Sismica INGV-Roma 92344401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-07 07:49:39 ± 0.18
Latitude 37.0325 ± 0.0054
Longitude 15.3605 ± 0.0101
Depth (km) 31 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93553211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 672
Semi-minor axis of confidence ellipse (meter) 626
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 296
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) 252
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 18
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53420
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 21
Type of magnitude ML
Reference to an origin 93553211
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-12 07:40:09

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 92344401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-07 07:53:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IACL.HHZ. 2021-07-07T07:50:08.27 3.0 undecidable manual Pn 1.44 0
IV.HVZN.HHZ. 2021-07-07T07:49:59.59 0.6 undecidable manual S 286 59.2962 112 0.42 43
IV.HLNI.HHZ. 2021-07-07T07:49:57.95 0.6 undecidable manual S 309 55.5999 114 -0.31 44
IV.HMDC.HHZ. 2021-07-07T07:49:57.42 0.6 undecidable manual S 261 51.8037 116 0.08 47
IV.HPAC.HHE. 2021-07-07T07:49:56.18 0.6 undecidable manual S 219 46.0206 119 0.22 46
IV.HCRL.HHZ. 2021-07-07T07:49:55.00 0.3 undecidable manual S 314 40.1265 123 0.38 68
IV.HAGA.HHZ. 2021-07-07T07:49:53.30 0.6 undecidable manual S 327 33.3444 128 0.16 48
IV.SSY.HHZ. 2021-07-07T07:49:51.91 0.6 undecidable manual S 299 28.9488 133 -0.33 46
IV.HAVL.HHZ. 2021-07-07T07:49:50.66 0.6 undecidable manual S 249 22.6551 140 -0.41 46
IV.HLNI.HHZ. 2021-07-07T07:49:50.29 0.3 undecidable manual P 309 55.5999 114 -0.18 68
IV.HVZN.HHZ. 2021-07-07T07:49:50.97 0.3 undecidable manual P 286 59.2962 112 -0.03 70
IV.HSRS.HHZ. 2021-07-07T07:49:49.61 0.6 undecidable manual S 299 13.9749 153 -0.19 49
IV.HPAC.HHE. 2021-07-07T07:49:49.08 0.3 undecidable manual P 219 46.0206 119 -0.06 72
IV.HMDC.HHZ. 2021-07-07T07:49:49.87 0.1 positive manual P 261 51.8037 116 -0.07 94
IV.HCRL.HHZ. 2021-07-07T07:49:48.51 0.3 undecidable manual P 314 40.1265 123 0.14 71
IV.HAGA.HHZ. 2021-07-07T07:49:47.58 0.1 negative manual P 327 33.3444 128 0.06 97
IV.SSY.HHZ. 2021-07-07T07:49:47.09 0.3 undecidable manual P 299 28.9488 133 0.1 73
IV.HAVL.HHZ. 2021-07-07T07:49:46.29 0.1 positive manual P 249 22.6551 140 -0.03 100
IV.HSRS.HHZ. 2021-07-07T07:49:45.54 0.3 undecidable manual P 299 13.9749 153 -0.05 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HSRS.HNE. ML:1.2 0.00007550045 0.3904 AML other m 2021-07-07T07:49:49.30
IV.HSRS.HHE. ML:1.6 0.00017981625000000002 0.1216 AML other m 2021-07-07T07:49:49.85
IV.HSRS.HHN. ML:1.4 0.000107624685 0.0768 AML other m 2021-07-07T07:49:49.93
IV.HAVL.HHE. ML:2.1 0.0004970561 0.0576 AML other m 2021-07-07T07:49:51.28
IV.HAVL.HHN. ML:2.1 0.00047194315000000006 0.0576 AML other m 2021-07-07T07:49:51.56
IV.SSY.HHE. ML:2.2 0.00056042715 0.096 AML other m 2021-07-07T07:49:52.91
IV.SSY.HHN. ML:2.7 0.0016480505 0.1216 AML other m 2021-07-07T07:49:53.81
IV.HAGA.HHN. ML:1.7 0.0001471546 0.0832 AML other m 2021-07-07T07:49:54.45
IV.HAGA.HHE. ML:1.7 0.0001535 0.06 AML other m 2021-07-07T07:49:54.61
IV.HCRL.HHE. ML:2.2 0.00039200000000000004 0.12 AML other m 2021-07-07T07:49:55.32
IV.HCRL.HHN. ML:2.2 0.00044500000000000003 0.1 AML other m 2021-07-07T07:49:56.53
IV.HMDC.HHN. ML:2.6 0.0007806171 0.1792 AML other m 2021-07-07T07:49:57.66
IV.HMDC.HNN. ML:2.5 0.0006355 0.18 AML other m 2021-07-07T07:49:57.67
IV.HMDC.HHE. ML:2.5 0.0006365 0.12 AML other m 2021-07-07T07:49:57.69
IV.HMDC.HNE. ML:2.4 0.000493 0.12 AML other m 2021-07-07T07:49:57.64
IV.HLNI.HHN. ML:1.7 0.00010391683 0.2816 AML other m 2021-07-07T07:49:58.46
IV.HLNI.HHE. ML:1.8 0.00012730910000000002 0.2176 AML other m 2021-07-07T07:49:58.88
IV.HVZN.HHE. ML:2.0 0.00017045470000000003 0.3008 AML other m 2021-07-07T07:50:00.25
IV.HVZN.HNE. ML:1.9 0.0001557576 0.3008 AML other m 2021-07-07T07:50:00.26
IV.HVZN.HHN. ML:2.1 0.0002165224 0.3776 AML other m 2021-07-07T07:50:01.64
IV.HVZN.HNN. ML:2.1 0.00020497455 0.3712 AML other m 2021-07-07T07:50:01.66
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