Earthquake with magnitude of ML 2.3 on date 28-09-2021 and time 23:40:23 (Italy) in region 1 km NW Gangi (PA)

A magnitude ML 2.3 earthquake occured in region: 1 km NW Gangi (PA), on

  • 28-09-2021 21:40:23 (UTC)
  • 28-09-2021 23:40:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.808, 14.201 at 6 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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Gangi PA 1 6811 6811
Geraci Siculo PA 7 1945 8756
Petralia Soprana PA 8 3360 12116
Petralia Sottana PA 10 2821 14937
Bompietro PA 11 1401 16338
San Mauro Castelverde PA 12 1701 18039
Blufi PA 12 1029 19068
Castel di Lucio ME 13 1294 20362
Castellana Sicula PA 14 3411 23773
Sperlinga EN 14 805 24578
Alimena PA 15 2032 26610
Castelbuono PA 17 8943 35553
Polizzi Generosa PA 18 3407 38960
Nicosia EN 19 13899 52859
Pettineo ME 19 1350 54209
Mistretta ME 20 4791 59000
Tusa ME 20 2925 61925

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NE of Caltanissetta (63360 inhabitants)
68 Km E of Bagheria (55387 inhabitants)
78 Km NE of Agrigento (59770 inhabitants)
81 Km E of Palermo (674435 inhabitants)
83 Km N of Gela (75827 inhabitants)
85 Km W of Catania (314555 inhabitants)
88 Km W of Acireale (52622 inhabitants)
100 Km N of Vittoria (63339 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
Reviewed
Rev100
ML 2.3 2021-09-28
21:40:23
37.8083 14.2008 6 2021-09-28
21:50:56
Sala Sismica INGV-Roma 96009061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-28 21:40:23 ± 0.15
Latitude 37.8083 ± 0.0081
Longitude 14.2008 ± 0.0091
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96009061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 818
Semi-minor axis of confidence ellipse (meter) 370
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 195
Circular confidence region, given by single value of horizontal uncertainty (meter) 820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 18
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
Epicentral distance of station farthest from the epicenter (degree) 0.97846
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 11
Magnitude information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.2
Num. used stations 50
Type of magnitude ML
Reference to an origin 96009061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 21:50:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PTRJ.HNZ. 2021-09-28T21:42:15.69 3.0 undecidable manual Sg 13.45 0
IV.SGG.HHZ. 2021-09-28T21:42:12.74 3.0 undecidable manual Sg 10.1 0
IV.SELL.HHZ. 2021-09-28T21:41:35.18 3.0 undecidable manual Sg 4.89 0
IV.PIPA.HHZ. 2021-09-28T21:41:07.63 3.0 negative manual Pn 1.07 0
IV.MTGR.HHZ. 2021-09-28T21:40:46.88 3.0 negative manual P 1.03 0
IV.MSRU.HHZ. 2021-09-28T21:40:45.35 3.0 negative manual P -0.45 0
IV.USI.HHZ. 2021-09-28T21:40:45.03 3.0 undecidable manual P -1.58 0
IV.SOLUN.HHZ. 2021-09-28T21:40:44.99 0.6 undecidable manual S 298 0.598 50 0.17 46
IV.CRJA.HHZ. 2021-09-28T21:40:42.88 3.0 undecidable manual P 0
IV.MMGO.HHZ. 2021-09-28T21:40:42.19 1.0 undecidable manual P 262 0.9785 50 -0.17 21
IV.MPNC.HHZ. 2021-09-28T21:40:42.74 3.0 negative manual P -0.43 0
IV.SCIAC.HHZ. 2021-09-28T21:40:42.06 0.1 undecidable manual P 252 0.9173 50 0.76 73
IV.IVPL.HHZ. 2021-09-28T21:40:40.30 3.0 positive manual P -0.27 0
IV.EMPL.HHZ. 2021-09-28T21:40:40.08 3.0 negative manual P 3.21 0
IV.EPIT.HHZ. 2021-09-28T21:40:39.27 3.0 positive manual P 1.44 0
IV.ECTS.HHZ. 2021-09-28T21:40:38.51 3.0 undecidable manual P -0.3 0
IV.MPG.HHZ. 2021-09-28T21:40:38.16 0.1 undecidable manual P 298 0.7509 50 -0.3 85
IV.IACL.HHZ. 2021-09-28T21:40:38.46 3.0 negative manual P -0.03 0
IV.SCIAR.HHZ. 2021-09-28T21:40:38.73 0.6 undecidable manual S 290 0.3795 50 0.37 46
IV.MSFR.HHZ. 2021-09-28T21:40:38.91 0.6 undecidable manual S 54 0.3813 50 0.49 45
IV.EMSG.HHZ. 2021-09-28T21:40:37.37 3.0 positive manual P 1.11 0
IV.EPZF.HHZ. 2021-09-28T21:40:35.52 3.0 positive manual P 0.62 0
IV.SOLUN.HHZ. 2021-09-28T21:40:35.55 0.6 undecidable manual P 298 0.598 50 -0.3 44
IV.MUCR.HHZ. 2021-09-28T21:40:35.47 3.0 positive manual P -0.47 0
IV.CPTP.HHZ. 2021-09-28T21:40:34.65 3.0 negative manual P 0.402 2.15 0
IV.ESCV.HHZ. 2021-09-28T21:40:34.48 3.0 undecidable manual P 0.09 0
IV.MCPD.HHZ. 2021-09-28T21:40:34.73 3.0 negative manual P -0.04 0
IV.RESU.HHZ. 2021-09-28T21:40:32.31 0.6 undecidable manual S 215 0.1979 106 0.8 40
IV.GIB.HHZ. 2021-09-28T21:40:32.95 0.3 undecidable manual S 323 0.2284 104 0.31 71
IV.MSFR.HHZ. 2021-09-28T21:40:31.95 0.1 positive manual P 54 0.3813 50 -0.2 94
IV.PLLN.EHZ. 2021-09-28T21:40:31.85 0.6 undecidable manual S 346 0.1898 107 0.63 43
IV.CSLB.HHZ. 2021-09-28T21:40:31.07 0.6 undecidable manual S 319 0.1709 108 0.52 45
IV.SCIAR.HHZ. 2021-09-28T21:40:31.28 1.0 undecidable manual P 290 0.3795 50 -0.84 19
IV.GALF.HHZ. 2021-09-28T21:40:30.78 0.1 positive manual P 109 0.3049 101 0.29 94
IV.GIB.HHZ. 2021-09-28T21:40:28.44 0.1 undecidable manual P 323 0.2284 104 -0.38 94
IV.CSLB.HHZ. 2021-09-28T21:40:27.05 0.1 positive manual P 319 0.1709 108 -0.56 91
IV.RESU.HHZ. 2021-09-28T21:40:27.64 0.1 positive manual P 215 0.1979 106 -0.53 92
IV.PLLN.EHZ. 2021-09-28T21:40:27.86 0.1 positive manual P 346 0.1898 107 -0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSLB.HHE. ML:2 0.000894 1.12 AML other m 2021-09-28T21:40:31.63
IV.CSLB.HHN. ML:2.2 0.00136 0.86 AML other m 2021-09-28T21:40:31.69
IV.GIB.HHE. ML:2.6 0.002715 0.36 AML other m 2021-09-28T21:40:33.76
IV.PLLN.EHN. ML:2.3 0.001485 0.52 AML other m 2021-09-28T21:40:34.94
IV.PLLN.EHE. ML:2.4 0.00185 1.56 AML other m 2021-09-28T21:40:34.98
IV.GIB.HHN. ML:2.6 0.00275 1.64 AML other m 2021-09-28T21:40:36.07
IV.RESU.HHN. ML:2.6 0.00279 0.58 AML other m 2021-09-28T21:40:37.41
IV.GALF.HHN. ML:2.3 0.0009545 1.52 AML other m 2021-09-28T21:40:39.82
IV.RESU.HHE. ML:2.3 0.00148 1.48 AML other m 2021-09-28T21:40:41.19
IV.GALF.HHE. ML:2.4 0.001145 1.66 AML other m 2021-09-28T21:40:41.98
IV.SCIAR.HHE. ML:2.3 0.0006495 0.46 AML other m 2021-09-28T21:40:42.24
IV.MSFR.HHE. ML:1.8 0.0001875 1.16 AML other m 2021-09-28T21:40:42.13
IV.SCIAR.HNE. ML:2.3 0.000669 0.22 AML other m 2021-09-28T21:40:43.26
IV.SCIAR.HHN. ML:2.4 0.0008395 1.12 AML other m 2021-09-28T21:40:43.40
IV.SCIAR.HNN. ML:2.4 0.000828 1.12 AML other m 2021-09-28T21:40:43.40
IV.MSFR.HHN. ML:1.9 0.0002565 0.54 AML other m 2021-09-28T21:40:44.95
IV.SOLUN.HHE. ML:2.4 0.000476 1.24 AML other m 2021-09-28T21:40:49.36
IV.MUCR.HHE. ML:2.2 0.0002995 0.62 AML other m 2021-09-28T21:40:50.48
IV.ESCV.HHE. ML:2.3 0.0005125 1.22 AML other m 2021-09-28T21:40:51.04
IV.MUCR.HHN. ML:2.2 0.000302 0.36 AML other m 2021-09-28T21:40:51.70
IV.CPTP.HHN. ML:2.2 0.0005915 0.64 AML other m 2021-09-28T21:40:52.16
IV.EPZF.HHN. ML:2.3 0.0004155 0.38 AML other m 2021-09-28T21:40:52.73
IV.SOLUN.HHN. ML:2.1 0.000247 0.96 AML other m 2021-09-28T21:40:53.37
IV.EPZF.HHE. ML:2.2 0.000381 1.12 AML other m 2021-09-28T21:40:54.88
IV.MPG.HHN. ML:1.8 8.74E-5 0.78 AML other m 2021-09-28T21:40:54.74
IV.CPTP.HHE. ML:2.1 0.0003845 0.72 AML other m 2021-09-28T21:40:54.36
IV.ESCV.HHN. ML:2.3 0.0005175 0.82 AML other m 2021-09-28T21:40:54.47
IV.MPG.HHE. ML:1.8 7.53E-5 1.32 AML other m 2021-09-28T21:40:55.73
IV.IACL.HHN. ML:2.4 0.000382 0.36 AML other m 2021-09-28T21:40:55.65
IV.EMSG.HHE. ML:2.4 0.0004565 0.54 AML other m 2021-09-28T21:40:56.37
IV.IVPL.HHE. ML:2.4 0.0002485 0.82 AML other m 2021-09-28T21:40:58.45
IV.EMSG.HHN. ML:2.4 0.000484 0.72 AML other m 2021-09-28T21:40:58.43
IV.ECTS.HHN. ML:2.2 0.0002265 0.34 AML other m 2021-09-28T21:40:58.55
IV.IACL.HHE. ML:2.4 0.0003775 0.48 AML other m 2021-09-28T21:40:59.84
IV.ECTS.HHE. ML:2.1 0.0001745 0.42 AML other m 2021-09-28T21:41:00.69
IV.IVPL.HHN. ML:2.4 0.0003115 0.8 AML other m 2021-09-28T21:41:02.64
IV.CRJA.HHE. ML:2.3 0.000196 0.7 AML other m 2021-09-28T21:41:04.40
IV.EPIT.HHN. ML:2.5 0.00048 0.54 AML other m 2021-09-28T21:41:04.68
IV.SCIAC.HHE. ML:1.9 7.155E-5 0.36 AML other m 2021-09-28T21:41:06.32
IV.CRJA.HHN. ML:2.4 0.0002125 0.82 AML other m 2021-09-28T21:41:06.35
IV.MMGO.HHE. ML:1.8 5.865E-5 0.42 AML other m 2021-09-28T21:41:06.47
IV.MPNC.HHE. ML:2.5 0.0002635 0.52 AML other m 2021-09-28T21:41:08.67
IV.MPNC.HHN. ML:2.5 0.000253 1.56 AML other m 2021-09-28T21:41:08.10
IV.MSRU.HHE. ML:2.5 0.000207 0.66 AML other m 2021-09-28T21:41:09.33
IV.EPIT.HHE. ML:2.2 0.0002595 0.56 AML other m 2021-09-28T21:41:09.13
IV.MMGO.HHN. ML:1.8 5.195E-5 0.42 AML other m 2021-09-28T21:41:10.98
IV.MSRU.HHN. ML:2.4 0.0001635 0.42 AML other m 2021-09-28T21:41:11.91
IV.SCIAC.HHN. ML:2 9.165E-5 0.48 AML other m 2021-09-28T21:41:12.18
IV.SELL.HHE. ML:1.7 9.945E-6 0.84 AML other m 2021-09-28T21:41:47.04
IV.SELL.HHN. ML:1.7 7.95E-6 0.64 AML other m 2021-09-28T21:41:50.94
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