Earthquake with magnitude of ML 2.2 on date 23-04-2021 and time 21:06:44 (UTC) in region 3 km NW Salaparuta (TP)

A magnitude ML 2.2 earthquake occured in region: 3 km NW Salaparuta (TP), on

  • 23-04-2021 21:06:44 (UTC)
  • 23-04-2021 23:06:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.778, 12.979 at 13 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
Salaparuta TP 3 1696 1696
Poggioreale TP 5 1494 3190
Montevago AG 8 3006 6196
Santa Ninfa TP 9 5043 11239
Partanna TP 10 10607 21846
Santa Margherita di Belice AG 10 6363 28209
Gibellina TP 10 4115 32324
Salemi TP 16 10794 43118
Camporeale PA 17 3373 46491
Roccamena PA 17 1505 47996
Vita TP 18 2056 50052
Calatafimi-Segesta TP 18 6712 56764
Sambuca di Sicilia AG 19 5877 62641
Contessa Entellina PA 19 1766 64407
Castelvetrano TP 20 31806 96213
Menfi AG 20 12592 108805

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Mazara del Vallo (51718 inhabitants)
48 Km E of Marsala (83194 inhabitants)
49 Km SE of Trapani (68759 inhabitants)
51 Km SW of Palermo (674435 inhabitants)
58 Km SW of Bagheria (55387 inhabitants)
75 Km NW of Agrigento (59770 inhabitants)
Recent and historical seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event *

This map reports the earthquake epicenters located in the 72 hours (3 days) preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event *

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located in the 90 days preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows 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 reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows 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 https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard
Shakemap
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 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
Bulletin
Rev1000
ML 2.2 2021-04-23
21:06:44
37.7778 12.9792 13 2021-07-12
16:55:15
Bollettino Sismico Italiano INGV 91319431
Reviewed
Rev100
ML 2.1 2021-04-23
21:06:44
37.7737 12.9482 11 2021-04-23
21:20:09
Sala Sismica INGV-Roma 89414391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-23 21:06:44 ± 0.21
Latitude 37.7778 ± 0.0108
Longitude 12.9792 ± 0.0171
Depth (km) 13 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91319431

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1438
Semi-minor axis of confidence ellipse (meter) 899
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 232
Circular confidence region, given by single value of horizontal uncertainty (meter) 1440
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
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) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.03058
Epicentral distance of station farthest from the epicenter (degree) 0.32825
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 91319431
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-16 13:57:28

ML:2.1

Field Value
Value 2.1
Uncertainty 0.5
Num. used stations 6
Type of magnitude ML
Reference to an origin 89414391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-23 21:20:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
MN.CLTB.HHZ. 2021-04-23T21:06:56.45 0.6 undecidable manual S 137 0.2743 96 1.04 35
IV.SCIAC.HHE. 2021-04-23T21:06:55.52 0.3 undecidable manual S 160 0.2788 96 -0.03 73
IV.MTGR.HHZ. 2021-04-23T21:06:53.30 0.6 undecidable manual S 304 0.2086 100 -0.19 48
IV.MARS.EHE. 2021-04-23T21:06:52.32 0.3 undecidable manual P 266 0.3283 94 0.46 66
IV.MBFT.HHZ. 2021-04-23T21:06:52.05 0.3 undecidable manual S 353 0.1691 105 -0.31 70
IV.SCIAC.HHE. 2021-04-23T21:06:50.67 0.1 undecidable manual P 160 0.2788 96 -0.34 93
IV.MTGR.HHZ. 2021-04-23T21:06:50.36 0.1 undecidable manual P 304 0.2086 100 0.54 88
IV.MMGO.HNZ. 2021-04-23T21:06:50.24 0.3 undecidable manual S 181 0.116 120 -0.65 66
MN.CLTB.HHZ. 2021-04-23T21:06:50.86 0.1 undecidable manual P 137 0.2743 96 -0.07 98
IV.CRJA.HHZ. 2021-04-23T21:06:49.79 0.3 undecidable manual S 40 0.0306 161 0.5 71
IV.MBFT.HHZ. 2021-04-23T21:06:48.78 0.1 undecidable manual P 353 0.1691 105 -0.39 92
IV.MMGO.HNZ. 2021-04-23T21:06:48.11 0.1 positive manual P 181 0.116 120 -0.21 98
IV.CRJA.HHZ. 2021-04-23T21:06:47.57 0.1 undecidable manual P 40 0.0306 161 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRJA.HHN. ML:2.2 0.002163579 1.68 AML other m 2021-04-23T21:06:49.90
IV.CRJA.HHE. ML:2.3 0.0026166465 0.1536 AML other m 2021-04-23T21:06:50.02
IV.MMGO.HNE. ML:0 0.001686256 0.064 AML other m 2021-04-23T21:06:50.50
IV.MMGO.HHE. ML:0 0.00171579 0.0768 AML other m 2021-04-23T21:06:50.48
IV.MMGO.HHN. ML:2.4 0.0025143845 0.1152 AML other m 2021-04-23T21:06:50.34
IV.MMGO.HNN. ML:2.4 0.0025119625 0.1152 AML other m 2021-04-23T21:06:50.35
IV.MBFT.HHN. ML:1 7.33E-5 0.98 AML other m 2021-04-23T21:06:53.53
IV.MBFT.HHE. ML:0.8 4.9948975E-5 0.3328 AML other m 2021-04-23T21:06:55.63
MN.CLTB.HHN. ML:2.3 0.0009235518 0.512 AML other m 2021-04-23T21:06:59.83
MN.CLTB.HHE. ML:2.2 0.0007061964 0.4352 AML other m 2021-04-23T21:07:00.31
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions *

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol 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