Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.6 on date 27-08-2017 and time 01:05:31 (Italy) in region 5 km NW Ragalna (CT)

A magnitude ML 2.6 earthquake occured in region: 5 km NW Ragalna (CT), on

  • 26-08-2017 23:05:31 (UTC)
  • 27-08-2017 01:05:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.6680, 14.9160 at 20 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
Ragalna CT 5 3924 3924
Biancavilla CT 5 24007 27931
Santa Maria di Licodia CT 6 7641 35572
Adrano CT 7 36122 71694
Belpasso CT 10 28108 99802
Paternò CT 10 48228 148030
Nicolosi CT 11 7463 155493
Camporotondo Etneo CT 14 5023 160516
Pedara CT 14 14102 174618
San Pietro Clarenza CT 14 7743 182361
Bronte CT 15 19172 201533
Trecastagni CT 16 10910 212443
Mascalucia CT 16 31958 244401
Centuripe EN 16 5470 249871
Zafferana Etnea CT 17 9517 259388
Viagrande CT 17 8563 267951
Tremestieri Etneo CT 17 20589 288540
Gravina di Catania CT 18 25838 314378
Motta Sant'Anastasia CT 18 12116 326494
Misterbianco CT 18 49410 375904
Maletto CT 19 3920 379824
Milo CT 19 1087 380911
Aci Bonaccorsi CT 19 3524 384435
San Giovanni la Punta CT 19 23060 407495
Sant'Agata li Battiati CT 19 9479 416974
Aci Sant'Antonio CT 20 17984 434958
Santa Venerina CT 20 8592 443550

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km W of Acireale (52622 inhabitants)
24 Km NW of Catania (314555 inhabitants)
75 Km NW of Siracusa (122291 inhabitants)
78 Km E of Caltanissetta (63360 inhabitants)
81 Km SW of Reggio di Calabria (183035 inhabitants)
81 Km SW of Messina (238439 inhabitants)
84 Km N of Ragusa (73313 inhabitants)
87 Km NE of Vittoria (63339 inhabitants)
89 Km NE of Gela (75827 inhabitants)
91 Km N of Modica (54633 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 2.6 2017-08-26
23:05:31		 37.6682 14.916 20 2018-07-06
15:40:36		 Bollettino Sismico Italiano INGV 53579261
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-08-26 23:05:31 ± 0.1
Latitude 37.6682 ± 0.0045
Longitude 14.9160 ± 0.0068
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 53579261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 627
Semi-minor axis of confidence ellipse (meter) 119
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 105
Circular confidence region, given by single value of horizontal uncertainty (meter) 630.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.05306
Epicentral distance of station farthest from the epicenter (degree) 1.42992
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 28
Magnitude information

ML:2.6

Field Value
Value 2.6
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 53579261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-01-31 13:54:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PLAC.HHE. 2017-08-26T23:06:16.19 0.6 undecidable manual S 56 158.7189 54 0.51 34
IV.SOI.EHN. 2017-08-26T23:06:03.07 0.6 undecidable manual S 65 109.3128 95 -0.06 42
IV.PLAC.HHE. 2017-08-26T23:05:57.46 0.1 positive manual P 56 158.7189 54 0.5 68
IV.IVPL.HHZ. 2017-08-26T23:05:55.03 0.6 undecidable manual S 4 78.7656 98 0.01 45
IV.MILZ.HHN. 2017-08-26T23:05:54.14 0.6 undecidable manual S 22 72.372 98 0.81 36
IV.SOI.EHN. 2017-08-26T23:05:50.07 0.1 positive manual P 65 109.3128 95 0.36 79
IV.MEU.SHZ. 2017-08-26T23:05:50.90 0.6 undecidable manual S 187 62.2932 100 0.23 45
IV.ALJA.HHZ. 2017-08-26T23:05:49.11 0.1 positive manual P 275 102.4197 96 0.46 79
IV.HPAC.HHE. 2017-08-26T23:05:49.10 0.1 undecidable manual P 174 107.0151 95 -0.25 81
IV.AGST.EHZ. 2017-08-26T23:05:48.80 0.6 undecidable manual S 149 53.2023 102 0.49 43
IV.HAGA.HHZ. 2017-08-26T23:05:47.30 0.6 undecidable manual S 154 47.4192 104 0.5 43
IV.GIB.HHE. 2017-08-26T23:05:46.84 0.1 undecidable manual P 295 85.7475 97 0.74 73
IV.MSRU.HHE. 2017-08-26T23:05:45.56 0.1 negative manual P 38 83.9493 97 -0.26 85
IV.MUCR.HHE. 2017-08-26T23:05:45.40 0.6 undecidable manual S 355 41.7249 107 0.07 48
IV.CSLB.HHZ. 2017-08-26T23:05:45.52 0.1 negative manual P 292 80.9523 97 0.16 88
IV.IVPL.HHZ. 2017-08-26T23:05:45.10 0.1 positive manual P 4 78.7656 98 0.07 89
IV.RESU.HHZ. 2017-08-26T23:05:45.25 0.1 negative manual P 268 75.4689 98 0.72 76
IV.PLLN.EHN. 2017-08-26T23:05:45.78 0.1 undecidable manual P 298 76.6677 98 1.07 65
IV.PETRA.HHN. 2017-08-26T23:05:44.21 0.1 undecidable manual P 285 72.6717 98 0.12 90
IV.HLNI.HHZ. 2017-08-26T23:05:44.00 0.6 undecidable manual S 186 35.6421 110 0.21 47
IV.RAFF.HHZ. 2017-08-26T23:05:43.39 0.6 undecidable manual P 225 69.4749 99 -0.22 44
IV.MILZ.HHN. 2017-08-26T23:05:43.73 0.1 negative manual P 22 72.372 98 -0.33 86
IV.MNO.SHZ. 2017-08-26T23:05:43.30 0.6 undecidable manual S 326 35.0427 111 -0.33 46
IV.GALF.HHZ. 2017-08-26T23:05:42.70 0.6 undecidable manual S 279 31.0467 114 0.06 49
IV.MEU.SHZ. 2017-08-26T23:05:41.85 0.1 undecidable manual P 187 62.2932 100 -0.67 79
IV.SSY.HHZ. 2017-08-26T23:05:41.70 0.1 undecidable manual P 166 58.2972 101 -0.22 90
IV.EPZF.HHZ. 2017-08-26T23:05:40.00 0.6 undecidable manual S 343 18.0708 131 0.31 47
IV.AGST.EHZ. 2017-08-26T23:05:40.81 0.1 undecidable manual P 149 53.2023 102 -0.34 89
IV.HAGA.HHZ. 2017-08-26T23:05:39.96 0.1 undecidable manual P 154 47.4192 104 -0.32 90
IV.AIO.HHZ. 2017-08-26T23:05:39.63 0.3 undecidable manual P 39 43.623 106 -0.08 71
IV.EMSG.HHZ. 2017-08-26T23:05:39.40 0.6 undecidable manual S 10 17.1717 133 -0.12 50
IV.MSFR.HHZ. 2017-08-26T23:05:39.60 0.3 undecidable manual P 325 49.5171 103 -0.99 52
IV.MUCR.HHE. 2017-08-26T23:05:38.77 0.3 undecidable manual P 355 41.7249 107 -0.66 61
IV.ESLN.HHE. 2017-08-26T23:05:38.70 0.6 undecidable manual S 61 5.8941 161 0.87 39
IV.ESML.HHZ. 2017-08-26T23:05:38.50 0.6 undecidable manual S 210 6.3936 159 0.62 44
IV.EPOZ.HHZ. 2017-08-26T23:05:37.26 0.3 undecidable manual P 89 23.9538 122 0.35 70
IV.MNO.SHZ. 2017-08-26T23:05:37.81 0.1 undecidable manual P 326 35.0427 111 -0.64 84
IV.GALF.HHZ. 2017-08-26T23:05:37.47 0.3 undecidable manual P 279 31.0467 114 -0.41 68
IV.HLNI.HHZ. 2017-08-26T23:05:37.97 0.3 undecidable manual P 186 35.6421 110 -0.58 64
IV.ESLN.HHE. 2017-08-26T23:05:35.25 0.1 positive manual P 61 5.8941 161 0.14 100
IV.EMSG.HHZ. 2017-08-26T23:05:35.78 0.3 undecidable manual P 10 17.1717 133 -0.3 72
IV.EPZF.HHZ. 2017-08-26T23:05:35.47 0.3 undecidable manual P 343 18.0708 131 -0.71 63
IV.ESML.HHZ. 2017-08-26T23:05:34.81 0.3 undecidable manual P 210 6.3936 159 -0.32 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HHN. ML:2.7 0.004115000000000001 1.44 AML other m 2017-08-26T23:05:38.24
IV.ESML.HHE. ML:2.7 0.004185 1.42 AML other m 2017-08-26T23:05:40.10
IV.EPZF.HHN. ML:2.7 0.00271 0.32 AML other m 2017-08-26T23:05:40.91
IV.EPZF.HHE. ML:2.9 0.004645 0.36 AML other m 2017-08-26T23:05:42.00
IV.EMSG.HHE. ML:2.9 0.0045449999999999996 0.38 AML other m 2017-08-26T23:05:42.27
IV.EMSG.HHN. ML:2.7 0.0032699999999999995 0.7 AML other m 2017-08-26T23:05:44.17
IV.HLNI.HHE. ML:3.0 0.0031450000000000002 0.46 AML other m 2017-08-26T23:05:44.67
IV.GALF.HHE. ML:2.5 0.0013599999999999999 0.46 AML other m 2017-08-26T23:05:44.67
IV.HLNI.HHN. ML:2.5 0.0011059999999999998 1.52 AML other m 2017-08-26T23:05:45.98
IV.GALF.HHN. ML:2.5 0.001355 1.6 AML other m 2017-08-26T23:05:45.07
IV.MNO.SHE. ML:0.0 0.000751 0.48 AML other m 2017-08-26T23:05:47.02
IV.AIO.HHE. ML:2.2 0.0005229999999999999 0.36 AML other m 2017-08-26T23:05:47.12
IV.HAGA.HHE. ML:2.2 0.0004345 1.1 AML other m 2017-08-26T23:05:48.74
IV.AGST.EHE. ML:2.8 0.00141 0.58 AML other m 2017-08-26T23:05:49.04
IV.MSFR.HHN. ML:1.7 0.00011999999999999999 1.08 AML other m 2017-08-26T23:05:49.45
IV.MNO.SHN. ML:0.0 0.0006675 0.6 AML other m 2017-08-26T23:05:49.64
IV.AIO.HHN. ML:2.2 0.000407 0.38 AML other m 2017-08-26T23:05:49.66
IV.AGST.EHN. ML:2.7 0.00125 0.24 AML other m 2017-08-26T23:05:50.12
IV.MEU.SHE. ML:0.0 0.0011324999999999998 0.32 AML other m 2017-08-26T23:05:51.31
IV.HAGA.HHN. ML:2.3 0.000527 0.52 AML other m 2017-08-26T23:05:52.80
IV.MSFR.HHE. ML:1.7 0.00011704999999999999 1.16 AML other m 2017-08-26T23:05:53.36
IV.RAFF.HHN. ML:2.7 0.0007935 1.5 AML other m 2017-08-26T23:05:55.12
IV.RAFF.HHE. ML:2.8 0.000981 1.4 AML other m 2017-08-26T23:05:55.19
IV.MEU.SHN. ML:0.0 0.0009615 0.28 AML other m 2017-08-26T23:05:55.27
IV.SSY.HHE. ML:2.4 0.000518 0.9 AML other m 2017-08-26T23:05:56.75
IV.SSY.HHN. ML:2.7 0.00108 0.42 AML other m 2017-08-26T23:05:57.70
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