Earthquake with magnitude of ML 2.3 on date 25-05-2021 and time 05:29:59 (Italy) in region 1 km NW Aci Sant'Antonio (CT)

A magnitude ML 2.3 earthquake occured in region: 1 km NW Aci Sant'Antonio (CT), on

  • 25-05-2021 03:29:59 (UTC)
  • 25-05-2021 05:29:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.6150, 15.1220 at 9 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Aci Sant'Antonio CT 1 17984 17984
Aci Bonaccorsi CT 2 3524 21508
Viagrande CT 2 8563 30071
Aci Catena CT 2 29851 59922
Trecastagni CT 4 10910 70832
Valverde CT 4 7840 78672
Acireale CT 4 52622 131294
San Giovanni la Punta CT 5 23060 154354
Pedara CT 5 14102 168456
San Gregorio di Catania CT 6 11966 180422
Tremestieri Etneo CT 6 20589 201011
Aci Castello CT 7 18723 219734
Sant'Agata li Battiati CT 7 9479 229213
Mascalucia CT 8 31958 261171
Gravina di Catania CT 8 25838 287009
Nicolosi CT 8 7463 294472
Santa Venerina CT 8 8592 303064
Zafferana Etnea CT 9 9517 312581
San Pietro Clarenza CT 10 7743 320324
Camporotondo Etneo CT 11 5023 325347
Milo CT 12 1087 326434
Catania CT 13 314555 640989
Belpasso CT 13 28108 669097
Giarre CT 14 27659 696756
Misterbianco CT 14 49410 746166
Sant'Alfio CT 15 1582 747748
Riposto CT 15 14838 762586
Ragalna CT 16 3924 766510
Mascali CT 17 14282 780792
Motta Sant'Anastasia CT 18 12116 792908
Paternò CT 20 48228 841136

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km W of Acireale (52622 inhabitants)
13 Km N of Catania (314555 inhabitants)
63 Km N of Siracusa (122291 inhabitants)
72 Km SW of Reggio di Calabria (183035 inhabitants)
75 Km SW of Messina (238439 inhabitants)
84 Km NE of Ragusa (73313 inhabitants)
90 Km NE of Modica (54633 inhabitants)
90 Km NE of Vittoria (63339 inhabitants)
94 Km E of Caltanissetta (63360 inhabitants)
98 Km NE of Gela (75827 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 2.3 2021-05-25
03:29:59
37.6148 15.1217 9 2021-12-29
11:12:25
Bollettino Sismico Italiano INGV 94999261
Reviewed
Rev200
ML 2.0 2021-05-25
03:29:59
37.674 15.083 9 2021-09-03
13:38:41
Sala Operativa INGV_OE (Catania) 90481581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-25 03:29:59 ± 0.11
Latitude 37.6148 ± 0.0072
Longitude 15.1217 ± 0.0102
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 94999261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 853
Semi-minor axis of confidence ellipse (meter) 784
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 326
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.07554
Epicentral distance of station farthest from the epicenter (degree) 0.90832
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 90481581
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-05-25 13:34:43

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 56
Type of magnitude ML
Reference to an origin 94999261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-03 13:38:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HPAC.HHZ. 2021-05-25T03:30:16.93 0.3 undecidable manual P 184 0.9083 50 0.09 64
IV.IVPL.HHZ. 2021-05-25T03:30:15.17 0.3 undecidable manual P 352 0.7689 50 0.71 56
IV.HMDC.HHZ. 2021-05-25T03:30:13.78 0.3 undecidable manual P 202 0.7087 50 0.36 63
IV.HAVL.HHZ. 2021-05-25T03:30:12.45 0.3 undecidable manual P 180 0.6547 50 -0.05 68
IV.MSFR.HHZ. 2021-05-25T03:30:12.10 0.6 undecidable manual P 315 0.5918 50 0.67 39
IV.MPNC.HHZ. 2021-05-25T03:30:11.26 0.3 undecidable manual P 19 0.5621 50 0.35 65
IV.SSY.HHZ. 2021-05-25T03:30:09.18 0.3 undecidable manual P 185 0.4587 50 0.04 71
IV.GALF.HHZ. 2021-05-25T03:30:09.90 0.3 undecidable manual P 282 0.4497 50 0.91 55
IV.MUCR.HHZ. 2021-05-25T03:30:09.31 0.3 undecidable manual P 336 0.4703 50 -0.04 71
IV.EFIU.HHZ. 2021-05-25T03:30:08.86 0.6 undecidable manual S 22 0.1880 113 1.36 31
IV.EPIT.HHZ. 2021-05-25T03:30:08.56 0.6 undecidable manual S 345 0.2032 112 0.54 45
IV.HCRL.HHZ. 2021-05-25T03:30:07.06 0.1 undecidable manual P 192 0.3390 50 -0.04 97
IV.ESML.HHZ. 2021-05-25T03:30:07.97 0.6 undecidable manual S 271 0.1916 113 0.34 47
IV.HLNI.HHZ. 2021-05-25T03:30:06.55 0.1 undecidable manual P 217 0.3318 50 -0.43 90
IV.ESAL.HHZ. 2021-05-25T03:30:06.28 0.6 undecidable manual S 4 0.1403 120 0.43 47
IV.HAGA.HHZ. 2021-05-25T03:30:06.72 0.3 undecidable manual P 175 0.3310 50 -0.24 70
IV.ESCV.HHZ. 2021-05-25T03:30:06.08 0.3 undecidable manual P 299 0.2761 106 0.07 73
IV.EMPL.HHZ. 2021-05-25T03:30:06.03 0.6 undecidable manual S 298 0.1358 121 0.33 48
IV.EPZF.HHZ. 2021-05-25T03:30:05.81 0.3 undecidable manual P 315 0.2959 50 -0.55 65
IV.EPOZ.HHZ. 2021-05-25T03:30:05.28 0.6 undecidable manual S 43 0.0773 136 1.35 31
IV.EPIT.HHZ. 2021-05-25T03:30:04.09 0.1 negative manual P 345 0.2032 112 -0.38 93
IV.EMFO.HHE. 2021-05-25T03:30:04.41 0.6 undecidable manual S 348 0.1232 123 -0.88 39
IV.ESML.HHZ. 2021-05-25T03:30:04.40 0.3 undecidable manual P 271 0.1916 113 0.16 73
IV.ENIC.HHZ. 2021-05-25T03:30:04.85 0.6 undecidable manual S 282 0.0809 135 0.83 40
IV.EMSG.HHZ. 2021-05-25T03:30:04.86 0.1 negative manual P 327 0.2464 108 -0.52 89
IV.EFIU.HHZ. 2021-05-25T03:30:04.00 0.1 undecidable manual P 22 0.1880 113 -0.17 98
IV.EVRN.HHZ. 2021-05-25T03:30:03.77 0.6 undecidable manual S 8 0.0755 137 -0.09 51
IV.ESAL.HHZ. 2021-05-25T03:30:03.06 0.1 positive manual P 4 0.1403 120 -0.16 99
IV.ECBD.HHN. 2021-05-25T03:30:03.27 0.1 undecidable manual P 350 0.1673 116 -0.48 92
IV.EPOZ.HHZ. 2021-05-25T03:30:02.34 0.1 undecidable manual P 43 0.0773 136 0.24 98
IV.EMPL.HHZ. 2021-05-25T03:30:02.84 0.1 negative manual P 298 0.1358 121 -0.29 96
IV.EMFO.HHE. 2021-05-25T03:30:02.24 0.1 undecidable manual P 348 0.1232 123 -0.65 87
IV.ENIC.HHZ. 2021-05-25T03:30:02.30 0.1 negative manual P 282 0.0809 135 0.15 100
IV.EVRN.HHZ. 2021-05-25T03:30:01.69 0.1 positive manual P 8 0.0755 137 -0.37 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HNE. ML:0.0 0.0096613445 0.1696 AML other m 2021-05-25T03:30:04.34
IV.EVRN.HHN. ML:0.0 0.016279645000000002 0.16 AML other m 2021-05-25T03:30:04.43
IV.EVRN.HNN. ML:0.0 0.0165 0.16 AML other m 2021-05-25T03:30:04.43
IV.EPOZ.HHE. ML:0.0 0.012308325499999998 1.7792 AML other m 2021-05-25T03:30:06.98
IV.EVRN.HHE. ML:0.0 0.011165 0.16 AML other m 2021-05-25T03:30:05.73
IV.EPOZ.HHN. ML:0.0 0.012 0.8 AML other m 2021-05-25T03:30:06.47
IV.ESAL.HHN. ML:0.0 0.0030217585 0.3392 AML other m 2021-05-25T03:30:10.99
IV.ENIC.HNN. ML:2.6 0.0057078829999999995 0.2096 AML other m 2021-05-25T03:30:07.26
IV.ENIC.HHN. ML:2.6 0.0060996285 0.28 AML other m 2021-05-25T03:30:08.73
IV.EMPL.HHN. ML:2.9 0.007643991 0.24 AML other m 2021-05-25T03:30:09.05
IV.ESML.HHN. ML:2.3 0.00149 0.4 AML other m 2021-05-25T03:30:09.64
IV.ESML.HNN. ML:2.3 0.00138 0.4 AML other m 2021-05-25T03:30:09.65
IV.EPIT.HHE. ML:2.4 0.0019450725000000001 0.44 AML other m 2021-05-25T03:30:09.71
IV.ESML.HHE. ML:2.4 0.0016699013999999998 0.28 AML other m 2021-05-25T03:30:09.76
IV.ESML.HNE. ML:2.3 0.001549785 0.2896 AML other m 2021-05-25T03:30:09.77
IV.ESAL.HHE. ML:0.0 0.0036047304999999997 0.3008 AML other m 2021-05-25T03:30:10.27
IV.EMPL.HHE. ML:2.7 0.0045475820000000005 0.36 AML other m 2021-05-25T03:30:10.80
IV.EPIT.HHN. ML:2.6 0.002532307 1.3808 AML other m 2021-05-25T03:30:11.22
IV.EFIU.HHE. ML:2.2 0.0012549999999999998 1.38 AML other m 2021-05-25T03:30:11.92
IV.ENIC.HHE. ML:2.7 0.007325421499999999 0.2192 AML other m 2021-05-25T03:30:11.70
IV.ENIC.HNE. ML:2.7 0.007935175499999999 0.2304 AML other m 2021-05-25T03:30:11.70
IV.HAGA.HHE. ML:1.8 0.00023653055 0.5616 AML other m 2021-05-25T03:30:13.51
IV.EPZF.HHE. ML:2.0 0.0004951807 0.4192 AML other m 2021-05-25T03:30:13.69
IV.HCRL.HHN. ML:1.9 0.00029063635 0.3392 AML other m 2021-05-25T03:30:13.87
IV.HCRL.HHE. ML:2.1 0.0004671872 0.16 AML other m 2021-05-25T03:30:14.38
IV.EFIU.HHN. ML:2.3 0.001545 0.72 AML other m 2021-05-25T03:30:14.55
IV.EPZF.HHN. ML:2.1 0.000576 0.3 AML other m 2021-05-25T03:30:15.10
IV.ESCV.HHE. ML:2.2 0.000730676 0.28 AML other m 2021-05-25T03:30:16.32
IV.ESCV.HHN. ML:2.3 0.00096334625 0.28 AML other m 2021-05-25T03:30:16.22
IV.HLNI.HHE. ML:1.6 0.00014808349999999998 0.24 AML other m 2021-05-25T03:30:16.59
IV.HLNI.HHN. ML:1.6 0.0001655583 0.1792 AML other m 2021-05-25T03:30:17.32
IV.EMSG.HHE. ML:2.1 0.00069528975 0.3792 AML other m 2021-05-25T03:30:17.43
IV.EMSG.HHN. ML:2.1 0.0006642034500000001 0.48 AML other m 2021-05-25T03:30:18.87
IV.GALF.HNN. ML:1.7 0.00013797925 1.2288 AML other m 2021-05-25T03:30:18.92
IV.GALF.HNE. ML:1.8 0.00017531840000000002 0.6096 AML other m 2021-05-25T03:30:20.47
IV.GALF.HHE. ML:2.7 0.0012890185 0.4592 AML other m 2021-05-25T03:30:20.75
IV.MSFR.HHE. ML:1.6 0.00006635953999999999 1.64 AML other m 2021-05-25T03:30:20.13
IV.MUCR.HHE. ML:1.8 0.00014013015 1.2592 AML other m 2021-05-25T03:30:22.64
IV.SSY.HHN. ML:2.8 0.0016479759999999998 0.24 AML other m 2021-05-25T03:30:22.84
IV.MPNC.HHN. ML:2.1 0.00026673135000000004 0.4016 AML other m 2021-05-25T03:30:23.62
IV.GALF.HHN. ML:2.5 0.000762117 0.52 AML other m 2021-05-25T03:30:23.99
IV.MUCR.HHN. ML:1.8 0.00014155024999999998 0.36 AML other m 2021-05-25T03:30:24.50
IV.SSY.HHE. ML:2.4 0.0006363551 0.5392 AML other m 2021-05-25T03:30:25.81
IV.HAGA.HHN. ML:1.6 0.00013771834999999998 1.5808 AML other m 2021-05-25T03:30:25.16
IV.HMDC.HHN. ML:2.0 0.00015556520000000002 0.48 AML other m 2021-05-25T03:30:26.57
IV.HAVL.HHN. ML:2.2 0.00027611675 0.2192 AML other m 2021-05-25T03:30:28.69
IV.IVPL.HHE. ML:2.5 0.0003696873 0.4208 AML other m 2021-05-25T03:30:29.59
IV.MPNC.HHE. ML:2.2 0.00029715955 0.4 AML other m 2021-05-25T03:30:30.10
IV.HMDC.HHE. ML:2.0 0.000124371085 0.2592 AML other m 2021-05-25T03:30:30.28
IV.IVPL.HHN. ML:2.4 0.00031196605 1.4208 AML other m 2021-05-25T03:30:30.95
IV.HMDC.HNE. ML:2.1 0.0001970003 0.76 AML other m 2021-05-25T03:30:31.85
IV.HAVL.HHE. ML:2.1 0.00018544215 0.2384 AML other m 2021-05-25T03:30:32.02
IV.HMDC.HNN. ML:2.0 0.00015972905 1.5904 AML other m 2021-05-25T03:30:32.93
IV.MSFR.HHN. ML:1.6 0.000078060485 1.1792 AML other m 2021-05-25T03:30:35.36
IV.HPAC.HHE. ML:2.3 0.000194596725 0.4992 AML other m 2021-05-25T03:30:42.26
IV.HPAC.HHN. ML:2.3 0.00020272010000000002 0.6608 AML other m 2021-05-25T03:30:42.82
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
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