Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.8 on date 21-07-2019 and time 11:41:33 (Italy) in region 7 km NW Sciacca (AG)

A magnitude ML 2.8 earthquake occured in region: 7 km NW Sciacca (AG), on

  • 21-07-2019 09:41:33 (UTC)
  • 21-07-2019 11:41:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.5590, 13.0370 at 10 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
Sciacca AG 7 40928 40928
Menfi AG 8 12592 53520
Sambuca di Sicilia AG 12 5877 59397
Santa Margherita di Belice AG 15 6363 65760
Caltabellotta AG 16 3681 69441
Montevago AG 17 3006 72447

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Mazara del Vallo (51718 inhabitants)
56 Km NW of Agrigento (59770 inhabitants)
59 Km E of Marsala (83194 inhabitants)
68 Km SW of Palermo (674435 inhabitants)
69 Km SE of Trapani (68759 inhabitants)
71 Km SW of Bagheria (55387 inhabitants)
91 Km W of Caltanissetta (63360 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
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 http://www.hsit.it. 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
Bulletin
Rev1000 		ML 2.8 2019-07-21
09:41:33		 37.5592 13.0367 10 2019-11-13
14:31:00		 Bollettino Sismico Italiano INGV 71937591
Reviewed
Rev100 		ML 2.8 2019-07-21
09:41:33		 37.5598 13.0308 10 2019-07-21
10:07:42		 Sala Sismica INGV-Roma 70765121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-07-21 09:41:33 ± 0.29
Latitude 37.5592 ± 0.0117
Longitude 13.0367 ± 0.0125
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 71937591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1464
Semi-minor axis of confidence ellipse (meter) 911
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 322
Circular confidence region, given by single value of horizontal uncertainty (meter) 1460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 178
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.52885
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:2.8

Field Value
Value 2.8
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 71937591
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-09-27 12:01:22

ML:2.8

Field Value
Value 2.8
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 70765121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-07-21 10:07:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MELA.HHZ. 2019-07-21T09:43:36.13 3.0 undecidable manual Sn -0.22 0
IV.LRP.EHZ. 2019-07-21T09:43:23.98 3.0 undecidable manual Sn -3.61 0
IV.MMUR.HNZ. 2019-07-21T09:43:20.35 3.0 negative manual Pg 17.23 0
IX.CLT3.HHZ.02 2019-07-21T09:43:14.06 3.0 undecidable manual Sn -7.12 0
IV.CAR1.HHZ. 2019-07-21T09:43:04.10 3.0 undecidable manual Sn 1.16 0
IT.VNF1.HGZ. 2019-07-21T09:42:38.49 3.0 negative manual Pn 1.05 0
IV.MRB1.HNZ. 2019-07-21T09:42:37.65 3.0 undecidable manual Pn 1.83 0
MN.VSL.HHZ. 2019-07-21T09:42:29.00 3.0 negative manual Pn -1.17 0
IV.MUCR.HHZ. 2019-07-21T09:42:04.77 0.3 undecidable manual P 71 169.6968 50 3.74 0
IV.MNO.SHZ. 2019-07-21T09:42:02.53 0.3 undecidable manual P 74 151.2375 50 4.36 0
IV.GALF.HHZ. 2019-07-21T09:42:01.27 0.6 undecidable manual P 82 135.4644 50 5.52 0
IV.MSFR.HHZ. 2019-07-21T09:42:00.29 0.3 undecidable manual P 68 146.1426 50 2.9 0
IV.PLLN.EHZ. 2019-07-21T09:41:55.44 0.3 undecidable manual P 63 108.3138 50 3.88 0
IV.CSLB.HHZ. 2019-07-21T09:41:54.00 0.1 undecidable manual P 65 98.9232 50 3.88 0
IV.RESU.HHZ. 2019-07-21T09:41:54.24 0.3 undecidable manual P 83 90.1431 50 5.47 0
IV.PETRA.HHZ. 2019-07-21T09:41:54.43 0.3 undecidable manual P 72 99.4227 50 4.24 0
IV.GIB.HHZ. 2019-07-21T09:41:53.92 0.3 undecidable manual P 61 99.0231 50 3.79 0
IV.CMDO.HHZ. 2019-07-21T09:41:51.69 0.1 undecidable manual P 98 69.9744 50 6.03 0
IV.FAVR.HHZ. 2019-07-21T09:41:50.68 0.1 undecidable manual P 120 64.2912 50 5.9 0
IV.ALJA.HHZ. 2019-07-21T09:41:49.26 0.3 undecidable manual P 71 66.378 50 4.16 0
IV.ERC.EHN. 2019-07-21T09:41:47.67 0.3 undecidable manual P 324 66.0894 50 2.61 0
IV.MBFT.HHZ. 2019-07-21T09:41:47.02 0.3 undecidable manual S 350 43.5231 50 -0.66 37
IV.CORL.HHZ. 2019-07-21T09:41:47.68 0.3 undecidable manual S 32 43.9227 50 -0.11 41
IV.SOLUN.HHZ. 2019-07-21T09:41:46.25 0.1 undecidable manual P 36 73.371 50 0.07 0
IV.CRJA.HHZ. 2019-07-21T09:41:43.68 0.3 undecidable manual S 354 27.0507 109 0.48 69
IV.CAVT.HHZ. 2019-07-21T09:41:43.68 0.3 undecidable manual S 298 28.0497 109 0.16 73
IV.MFNL.HHZ. 2019-07-21T09:41:43.91 0.6 undecidable manual S 339 27.5502 109 0.54 45
IV.MARS.EHZ. 2019-07-21T09:41:42.30 0.1 undecidable manual P 298 46.7199 50 0.23 39
IV.CORL.HHZ. 2019-07-21T09:41:41.97 0.1 undecidable manual P 32 43.9227 50 0.32 52
IV.MBFT.HHZ. 2019-07-21T09:41:41.25 0.1 undecidable manual P 350 43.5231 50 -0.33 54
IV.CRJA.HHZ. 2019-07-21T09:41:39.15 0.1 undecidable manual P 354 27.0507 109 0.15 98
IV.CAVT.HHZ. 2019-07-21T09:41:39.24 0.1 undecidable manual P 298 28.0497 109 0.06 100
IV.MFNL.HHZ. 2019-07-21T09:41:39.24 0.1 undecidable manual P 339 27.5502 109 0.14 98
IV.MMGO.HHE. 2019-07-21T09:41:37.48 0.3 undecidable manual S 335 12.5763 127 -1.24 49
IV.MMGO.HHE. 2019-07-21T09:41:36.17 0.1 undecidable manual P 335 12.5763 127 -0.23 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRJA.HHN. ML:3.3 0.010748434500000001 0.16 AML other m 2019-07-21T09:41:43.96
IV.CAVT.HHE. ML:3.0 0.0057835665 0.096 AML other m 2019-07-21T09:41:43.88
IV.CRJA.HHE. ML:3.3 0.011241659999999999 1.84 AML other m 2019-07-21T09:41:43.94
IV.CAVT.HHN. ML:3.1 0.007074024 0.1024 AML other m 2019-07-21T09:41:44.01
IV.MFNL.HHE. ML:3.2 0.0078393695 0.3456 AML other m 2019-07-21T09:41:46.53
IV.MBFT.HNE. ML:2.2 0.00046060489999999996 0.3328 AML other m 2019-07-21T09:41:47.74
IV.MBFT.HHE. ML:3.1 0.003816777 0.32 AML other m 2019-07-21T09:41:47.75
IV.MBFT.HNN. ML:2.1 0.00041548035 1.5712 AML other m 2019-07-21T09:41:47.17
IV.MBFT.HHN. ML:3.1 0.0035764620000000003 1.5584 AML other m 2019-07-21T09:41:47.96
IV.CORL.HHE. ML:2.9 0.0023305205 0.64 AML other m 2019-07-21T09:41:50.54
IV.MFNL.HHN. ML:2.9 0.0045908995 1.5584 AML other m 2019-07-21T09:41:51.97
IV.MARS.EHN. ML:2.7 0.0013947235 0.6016 AML other m 2019-07-21T09:41:55.78
IV.CORL.HHN. ML:2.9 0.002733424 0.64 AML other m 2019-07-21T09:41:55.79
IV.MARS.EHE. ML:2.7 0.0013019579000000002 1.3984 AML other m 2019-07-21T09:41:56.96
IV.MSFR.HHE. ML:2.2 0.00009591451 0.5184 AML other m 2019-07-21T09:42:03.58
IV.SOLUN.HHE. ML:3.0 0.0015450735 0.6016 AML other m 2019-07-21T09:42:03.43
IV.MSFR.HHN. ML:2.3 0.00009913374 0.48 AML other m 2019-07-21T09:42:04.36
IV.SOLUN.HHN. ML:2.9 0.0013495935 0.8576 AML other m 2019-07-21T09:42:05.18
IV.FAVR.HHN. ML:2.8 0.001224968 0.7808 AML other m 2019-07-21T09:42:07.33
IV.FAVR.HNN. ML:2.8 0.0011394035 0.7616 AML other m 2019-07-21T09:42:07.33
IV.FAVR.HNE. ML:2.8 0.0012719155 0.4992 AML other m 2019-07-21T09:42:08.44
IV.FAVR.HHE. ML:2.5 0.0006434616 0.4992 AML other m 2019-07-21T09:42:08.44
IV.ALJA.HHN. ML:2.8 0.0012421405 1.1232 AML other m 2019-07-21T09:42:10.20
IV.ALJA.HHE. ML:2.7 0.00091788435 0.5632 AML other m 2019-07-21T09:42:11.08
IV.CSLB.HHN. ML:2.4 0.00024690255 0.6976 AML other m 2019-07-21T09:42:11.39
IV.CMDO.HHE. ML:2.4 0.00038630625 0.7424 AML other m 2019-07-21T09:42:11.57
IV.CSLB.HHE. ML:2.5 0.0003062915 0.6848 AML other m 2019-07-21T09:42:12.67
IV.GIB.HHE. ML:3.2 0.0014480275000000001 1.0816 AML other m 2019-07-21T09:42:13.33
IV.PETRA.HHE. ML:2.9 0.00080354695 1.4176 AML other m 2019-07-21T09:42:17.06
IV.RESU.HHE. ML:2.8 0.0006781336 0.6784 AML other m 2019-07-21T09:42:17.55
IV.PLLN.EHE. ML:2.9 0.0007337091500000001 1.4368 AML other m 2019-07-21T09:42:17.84
IV.CMDO.HHN. ML:2.4 0.00045955084999999994 1.0624 AML other m 2019-07-21T09:42:18.45
IV.GIB.HHN. ML:3.1 0.001364598 0.6016 AML other m 2019-07-21T09:42:18.57
IV.PETRA.HHN. ML:2.8 0.0006762713 1.2 AML other m 2019-07-21T09:42:19.19
IV.RESU.HHN. ML:2.8 0.0008433798000000001 0.7616 AML other m 2019-07-21T09:42:20.61
IV.GALF.HNE. ML:2.3 0.0001143233 0.9376 AML other m 2019-07-21T09:42:21.84
IV.PLLN.EHN. ML:3.0 0.00085521965 0.64 AML other m 2019-07-21T09:42:22.57
IV.MNO.SHE. ML:0.0 0.00053128155 0.8384 AML other m 2019-07-21T09:42:32.44
IV.GALF.HHE. ML:3.0 0.00059777105 0.7232 AML other m 2019-07-21T09:42:34.69
IV.GALF.HHN. ML:3.0 0.0006077268499999999 1.3024 AML other m 2019-07-21T09:42:35.85
IV.MUCR.HHE. ML:2.7 0.00021370265 1.4048 AML other m 2019-07-21T09:42:37.20
IV.GALF.HNN. ML:2.4 0.000138739025 1.1712 AML other m 2019-07-21T09:42:40.83
IV.MUCR.HHN. ML:2.8 0.00023207415 1.1808 AML other m 2019-07-21T09:42:41.39
IV.MNO.SHN. ML:0.0 0.00028992305 0.8 AML other m 2019-07-21T09:42:41.48
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, /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