Earthquake with magnitude of ML 3.1 on date 20-07-2021 and time 09:43:55 (UTC) in region Canale di Sicilia meridionale (MARE)

A magnitude ML 3.1 earthquake occured in region: Canale di Sicilia meridionale (MARE), on

  • 20-07-2021 09:43:55 (UTC)
  • 20-07-2021 11:43:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.663, 13.32 at 32 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
76 Km S of Agrigento (59770 inhabitants)
94 Km SW 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, 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 ( 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.

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and updated as more data become available. See for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15,
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.
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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 3.1 2021-07-20
36.6628 13.3202 32 2021-07-20
Sala Sismica INGV-Roma 92985021
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-07-20 09:43:55 ± 0.16
Latitude 36.6628 ± 0.0090
Longitude 13.3202 ± 0.0157
Depth (km) 32 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 92985021


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1113
Semi-minor axis of confidence ellipse (meter) 980
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 1110
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.53694
Number of stations at which the event was observed 44
Number of stations from which data was used for origin computation 27
Magnitude information


Field Value
Value 3.1
Uncertainty 0.3
Num. used stations 56
Type of magnitude ML
Reference to an origin 92985021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-20 10:12:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IMOL.HNZ. 2021-07-20T09:45:42.52 3.0 negative manual Pn -4.76 0
MN.PDG.HHZ. 2021-07-20T09:45:39.64 3.0 positive manual Pn -2.61 0
IV.CSNT.HHZ. 2021-07-20T09:45:33.38 3.0 negative manual Pn -2.72 0
IV.TST02.HHZ. 2021-07-20T09:45:30.16 3.0 undecidable manual Pg 15.57 0
IV.FERC.HNZ. 2021-07-20T09:45:23.47 3.0 undecidable manual Sg 4.81 0
IV.VAGA.HHZ. 2021-07-20T09:45:21.69 3.0 positive manual Pg 14.84 0
IV.SGG.HHZ. 2021-07-20T09:45:18.67 3.0 negative manual Pg 11.93 0
IV.RMP.HHZ. 2021-07-20T09:45:13.55 3.0 negative manual Pn 2.06 0
IV.BULT.EHZ. 2021-07-20T09:45:12.01 3.0 positive manual Pn 3.15 0
IV.PTRJ.HHZ. 2021-07-20T09:45:06.95 3.0 undecidable manual Pn 0.19 0
IX.SCL3.EHZ.02 2021-07-20T09:45:04.00 3.0 negative manual Pn 2.77 0
TV.SU26.HHZ. 2021-07-20T09:45:03.83 3.0 negative manual Pg 3.66 0
IV.ILOS.HHZ. 2021-07-20T09:45:01.93 3.0 undecidable manual Sn -1.15 0
MN.VSL.HHZ. 2021-07-20T09:44:58.71 3.0 positive manual Pn 2.54 0
IV.MBFT.HHZ. 2021-07-20T09:44:36.04 0.6 undecidable manual S 347 1.3157 54 1 34
IV.MTGR.HHZ. 2021-07-20T09:44:35.25 0.6 undecidable manual S 340 1.3085 54 0.38 43
MN.WDD.HHE. 2021-07-20T09:44:34.43 0.6 undecidable manual S 130 1.2734 54 0.38 43
IV.HMDC.HHZ. 2021-07-20T09:44:32.32 0.6 undecidable manual S 75 1.2069 54 -0.14 46
IV.AIO.HHZ. 2021-07-20T09:44:32.18 3.0 positive manual Pg 3.74 0
IV.IFIL.HHZ. 2021-07-20T09:44:30.16 3.0 negative manual Pn -0.43 0
IV.MMGO.HHZ. 2021-07-20T09:44:27.90 0.6 undecidable manual S 345 1.0351 54 -0.45 45
IV.HVIT.HHZ. 2021-07-20T09:44:26.65 0.6 undecidable manual S 71 1.0162 54 -1.23 32
IV.MSFR.HHZ. 2021-07-20T09:44:25.90 3.0 positive manual Pn 1.42 0
IV.LINA.HHZ. 2021-07-20T09:44:24.87 0.3 undecidable manual S 205 0.8723 104 0.52 68
IV.SCIAC.HHZ. 2021-07-20T09:44:23.72 0.6 undecidable manual S 349 0.8705 104 -0.59 45
IV.GALF.HHZ. 2021-07-20T09:44:21.84 0.6 positive manual P 43 1.4425 54 1.8 20
IV.CLTA.HHZ. 2021-07-20T09:44:21.00 1.0 undecidable manual S 46 0.7123 107 1.21 17
IV.LEVAN.EHE. 2021-07-20T09:44:21.18 0.1 undecidable manual P 330 1.5369 54 -0.16 81
IV.ERC.EHE. 2021-07-20T09:44:20.52 0.1 undecidable manual P 337 1.492 54 -0.2 82
IV.SOLUN.HHZ. 2021-07-20T09:44:20.92 0.6 negative manual P 7 1.438 54 0.29 42
IV.SSY.HHZ. 2021-07-20T09:44:20.96 0.1 negative manual P 70 1.4857 54 0.33 80
IV.HCRL.HHZ. 2021-07-20T09:44:20.76 0.1 positive manual P 65 1.501 54 -0.08 84
IV.HAVL.HHZ. 2021-07-20T09:44:20.01 0.1 positive manual P 78 1.4722 54 -0.43 79
IV.CSLB.HHZ. 2021-07-20T09:44:20.68 0.1 undecidable manual P 24 1.402 54 1.2 60
IV.HLNI.HHZ. 2021-07-20T09:44:19.32 0.6 positive manual P 61 1.4155 54 -0.34 42
IV.HPAC.HHZ. 2021-07-20T09:44:18.96 0.6 undecidable manual P 88 1.3769 54 -0.17 44
IV.MBFT.HHZ. 2021-07-20T09:44:18.44 0.1 positive manual P 347 1.3157 54 0.16 90
IV.MTGR.HHZ. 2021-07-20T09:44:17.89 0.1 negative manual P 340 1.3085 54 -0.29 88
MN.WDD.HHE. 2021-07-20T09:44:17.54 0.1 undecidable manual P 130 1.2734 54 -0.16 91
IV.MARS.HHZ. 2021-07-20T09:44:17.47 0.6 undecidable manual P 331 1.2447 54 0.17 46
IV.ALJA.HHZ. 2021-07-20T09:44:17.60 0.3 undecidable manual P 18 1.1394 54 1.76 34
IV.HVZN.HHZ. 2021-07-20T09:44:16.78 0.3 positive manual P 65 1.2285 54 -0.29 67
IV.HMDC.HHZ. 2021-07-20T09:44:16.11 0.3 undecidable manual P 75 1.2069 54 -0.68 60
IV.CRJA.HHZ. 2021-07-20T09:44:16.13 0.1 negative manual P 348 1.1655 54 -0.08 95
IV.CPTP.HHZ. 2021-07-20T09:44:15.48 0.6 positive manual P 42 1.0027 54 1.52 28
IV.CMDO.HHZ. 2021-07-20T09:44:14.86 0.6 negative manual P 26 0.8957 54 2.38 13
IV.HVIT.HHZ. 2021-07-20T09:44:13.34 0.3 positive manual P 71 1.0162 54 -0.8 60
IV.MMGO.HHZ. 2021-07-20T09:44:13.65 0.3 undecidable manual P 345 1.0351 54 -0.76 60
IV.RAFF.HHZ. 2021-07-20T09:44:13.96 0.1 positive manual P 56 1.0027 54 0 100
MN.CLTB.HHZ. 2021-07-20T09:44:12.67 0.6 negative manual P 355 0.9182 54 -0.12 50
IV.SCIAC.HHZ. 2021-07-20T09:44:11.16 0.1 undecidable manual P 349 0.8705 104 -0.92 79
IV.LINA.HHZ. 2021-07-20T09:44:11.60 0.1 undecidable manual P 205 0.8723 104 -0.5 93
IV.CLTA.HHZ. 2021-07-20T09:44:09.90 0.1 positive manual P 46 0.7123 107 0.43 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CLTA.HHN. ML:2.6 0.00058330565 2.3232 AML other m 2021-07-20T09:44:26.45
IV.SCIAC.HHE. ML:3.3 0.001985 0.38 AML other m 2021-07-20T09:44:24.35
IV.LINA.HHN. ML:3.7 0.005455 0.36 AML other m 2021-07-20T09:44:26.37
IV.LINA.HHE. ML:3.8 0.00561 0.46 AML other m 2021-07-20T09:44:26.81
IV.MMGO.HNE. ML:2.5 0.000258 0.76 AML other m 2021-07-20T09:44:28.66
IV.MMGO.HHE. ML:2.5 0.000252 0.74 AML other m 2021-07-20T09:44:28.66
IV.SCIAC.HHN. ML:3.1 0.00117 0.56 AML other m 2021-07-20T09:44:30.52
IV.CLTA.HHE. ML:2.6 0.000504 0.46 AML other m 2021-07-20T09:44:34.16
IV.HVIT.HHE. ML:3 0.000886 0.96 AML other m 2021-07-20T09:44:34.91
IV.MMGO.HHN. ML:2.6 0.0003 0.48 AML other m 2021-07-20T09:44:34.85
IV.CRJA.HHN. ML:3.1 0.000761 0.44 AML other m 2021-07-20T09:44:34.83
IV.MTGR.HHE. ML:2.3 0.00010605 0.7 AML other m 2021-07-20T09:44:35.81
IV.MTGR.HHN. ML:2.6 0.000221 0.5 AML other m 2021-07-20T09:44:36.57
IV.MBFT.HHE. ML:2.8 0.000344 0.38 AML other m 2021-07-20T09:44:36.68
MN.CLTB.HHN. ML:3.9 0.007505 0.56 AML other m 2021-07-20T09:44:37.52
IV.MBFT.HHN. ML:2.8 0.0003485 0.36 AML other m 2021-07-20T09:44:37.61
IV.RAFF.HHE. ML:3.1 0.001075 0.56 AML other m 2021-07-20T09:44:38.51
IV.RAFF.HHN. ML:3 0.000757 1.5 AML other m 2021-07-20T09:44:38.17
IV.ALJA.HHE. ML:2.8 0.000373 0.72 AML other m 2021-07-20T09:44:39.59
IV.MMGO.HNN. ML:2.6 0.0002935 1.58 AML other m 2021-07-20T09:44:40.18
IV.SOLUN.HHN. ML:2.9 0.000386 0.98 AML other m 2021-07-20T09:44:40.27
IV.HVIT.HHN. ML:3.1 0.000902 0.48 AML other m 2021-07-20T09:44:41.26
IV.HVZN.HNN. ML:3.5 0.00187 1.54 AML other m 2021-07-20T09:44:41.85
IV.HVZN.HHN. ML:3.5 0.002005 1.54 AML other m 2021-07-20T09:44:41.85
IV.HMDC.HHN. ML:3.1 0.0008175 0.68 AML other m 2021-07-20T09:44:41.62
IV.ALJA.HHN. ML:2.6 0.0002415 0.92 AML other m 2021-07-20T09:44:42.31
IV.CRJA.HHE. ML:3.1 0.0008625 0.5 AML other m 2021-07-20T09:44:42.96
IV.MARS.HNE. ML:2.9 0.00041 1.58 AML other m 2021-07-20T09:44:43.07
IV.MARS.HHE. ML:2.9 0.000416 1.6 AML other m 2021-07-20T09:44:43.07
IV.HVZN.HNE. ML:3.5 0.001995 0.5 AML other m 2021-07-20T09:44:43.80
IV.CPTP.HHE. ML:2.9 0.0006695 0.6 AML other m 2021-07-20T09:44:44.34
IV.CSLB.HHN. ML:2.6 0.000179 0.74 AML other m 2021-07-20T09:44:44.40
IV.CSLB.HHE. ML:2.4 0.00012 0.44 AML other m 2021-07-20T09:44:46.23
IV.HVZN.HHE. ML:3.6 0.002065 0.42 AML other m 2021-07-20T09:44:46.46
MN.CLTB.HHE. ML:3.6 0.003735 0.46 AML other m 2021-07-20T09:44:46.37
IV.MARS.HNN. ML:2.9 0.000497 1.02 AML other m 2021-07-20T09:44:47.72
IV.MARS.HHN. ML:3 0.0005 1.02 AML other m 2021-07-20T09:44:47.72
IV.SOLUN.HHE. ML:2.9 0.000347 1.4 AML other m 2021-07-20T09:44:47.97
IV.CMDO.HHN. ML:2.8 0.000608 0.86 AML other m 2021-07-20T09:44:48.07
IV.HMDC.HHE. ML:2.9 0.000543 1.44 AML other m 2021-07-20T09:44:49.13
IV.HAVL.HHN. ML:3.2 0.000687 0.38 AML other m 2021-07-20T09:44:49.39
IV.CMDO.HHE. ML:2.6 0.0004075 0.56 AML other m 2021-07-20T09:44:49.26
IV.HLNI.HHN. ML:3.1 0.0006355 1.12 AML other m 2021-07-20T09:44:49.67
IV.HPAC.HHN. ML:3.6 0.001795 0.82 AML other m 2021-07-20T09:44:50.79
IV.GALF.HHE. ML:3.3 0.0009905 0.6 AML other m 2021-07-20T09:44:50.16
IV.HPAC.HHE. ML:3.3 0.001093 0.96 AML other m 2021-07-20T09:44:51.54
IV.HLNI.HHE. ML:3 0.0005 0.78 AML other m 2021-07-20T09:44:52.09
IV.CPTP.HHN. ML:3 0.000714 0.74 AML other m 2021-07-20T09:44:52.58
IV.SSY.HHE. ML:3.8 0.002645 0.68 AML other m 2021-07-20T09:44:54.32
IV.HAVL.HHE. ML:3.2 0.0007395 0.8 AML other m 2021-07-20T09:44:55.35
IV.SSY.HHN. ML:4.1 0.00484 0.8 AML other m 2021-07-20T09:44:55.40
IV.HCRL.HHE. ML:3.1 0.0004725 1.44 AML other m 2021-07-20T09:44:56.08
IV.HCRL.HHN. ML:3.2 0.0007285 1.24 AML other m 2021-07-20T09:44:56.11
IV.GALF.HHN. ML:3.4 0.0011645 0.56 AML other m 2021-07-20T09:44:58.83
IV.IFIL.HHE. ML:3.6 0.000847 0.46 AML other m 2021-07-20T09:44:59.25
IV.IFIL.HHN. ML:3.3 0.0004425 0.36 AML other m 2021-07-20T09:45:02.71
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, 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, 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.
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