Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 3.2 on date 16-03-2011 and time 18:34:05 (Italy) in region 5 km NE Ragalna (CT)

A magnitude ML 3.2 earthquake occured in region: 5 km NE Ragalna (CT), on

  • 16-03-2011 17:34:05 (UTC)
  • 16-03-2011 18:34:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6730, 14.9660 at 16 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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Did you feel it? Fill in the questionnaire.

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
Nicolosi CT 8 7463 11387
Belpasso CT 9 28108 39495
Biancavilla CT 9 24007 63502
Santa Maria di Licodia CT 9 7641 71143
Pedara CT 10 14102 85245
Adrano CT 12 36122 121367
Trecastagni CT 12 10910 132277
Paternò CT 12 48228 180505
Camporotondo Etneo CT 12 5023 185528
San Pietro Clarenza CT 12 7743 193271
Zafferana Etnea CT 12 9517 202788
Mascalucia CT 13 31958 234746
Viagrande CT 13 8563 243309
Tremestieri Etneo CT 14 20589 263898
Milo CT 14 1087 264985
Gravina di Catania CT 15 25838 290823
Aci Bonaccorsi CT 15 3524 294347
Santa Venerina CT 15 8592 302939
San Giovanni la Punta CT 16 23060 325999
Aci Sant'Antonio CT 16 17984 343983
Sant'Agata li Battiati CT 16 9479 353462
Misterbianco CT 17 49410 402872
Bronte CT 17 19172 422044
San Gregorio di Catania CT 17 11966 434010
Valverde CT 17 7840 441850
Aci Catena CT 17 29851 471701
Sant'Alfio CT 18 1582 473283
Motta Sant'Anastasia CT 18 12116 485399
Acireale CT 19 52622 538021
Maletto CT 20 3920 541941

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km W of Acireale (52622 inhabitants)
22 Km NW of Catania (314555 inhabitants)
74 Km NW of Siracusa (122291 inhabitants)
77 Km SW of Reggio di Calabria (183035 inhabitants)
78 Km SW of Messina (238439 inhabitants)
82 Km E of Caltanissetta (63360 inhabitants)
86 Km N of Ragusa (73313 inhabitants)
89 Km NE of Vittoria (63339 inhabitants)
92 Km N of Modica (54633 inhabitants)
92 Km NE 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, 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

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 http://shakemap.ingv.it 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, https://doi.org/10.13127/cpti/cpti15.3).
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 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 3.2 2011-03-16
17:34:05		 37.673 14.966 16 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 1182669
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2011-03-16 17:34:05 ± 0.1
Latitude 37.6730 ± 0.0054
Longitude 14.9660 ± 0.0102
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1182669

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 847
Semi-minor axis of confidence ellipse (meter) 232
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 271
Circular confidence region, given by single value of horizontal uncertainty (meter) 1081.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.39395
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 21
Magnitude information

ML:3.2

Field Value
Value 3.2
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 1182669
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 23:05:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FAGN.HHE. 2011-03-16T17:35:17.14 10.0 undecidable manual Pg 0 0 0
IV.ATPC.HHE. 2011-03-16T17:35:10.13 10.0 undecidable manual Pg 0 0 0
IV.ATVO.HHE. 2011-03-16T17:34:43.09 10.0 undecidable manual Pg 0 0 0
IV.MTGR.SHZ. 2011-03-16T17:34:40.54 10.0 undecidable manual Pg 0 0 0
IV.SCHR.EHZ. 2011-03-16T17:34:40.33 10.0 undecidable manual Pg 0 0 0
IV.MCEL.HHE. 2011-03-16T17:34:38.52 10.0 undecidable manual Pg 0 0 0
IV.GIB.HHN. 2011-03-16T17:34:36.61 10.0 undecidable manual Pg 0 0 0
IV.MMGO.SHZ. 2011-03-16T17:34:34.45 10.0 undecidable manual Pg 0 0 0
IV.PLAC.HHE. 2011-03-16T17:34:31.35 0.3 undecidable manual Pg 56 154.7229 0.272 54
IV.HMDC.HHZ. 2011-03-16T17:34:30.70 0.6 undecidable manual Sg 192 80.8635 0.806 36
IV.HAVL.HHE. 2011-03-16T17:34:30.41 0.6 undecidable manual Sg 170 80.364 0.652 39
IV.IFIL.EHE. 2011-03-16T17:34:29.35 10.0 undecidable manual Sg 0 0 0
IV.RESU.HHN. 2011-03-16T17:34:28.09 10.0 undecidable manual Sg 0 0 0
IV.HVZN.HHZ. 2011-03-16T17:34:24.53 0.1 undecidable manual Sg 202 59.1963 0.401 86
IV.RESU.HHN. 2011-03-16T17:34:24.54 10.0 undecidable manual Pg 0 0 0
IV.SSY.HHZ. 2011-03-16T17:34:24.55 0.1 undecidable manual Sg 171 57.9975 0.74 78
IV.IFIL.EHE. 2011-03-16T17:34:23.82 10.0 undecidable manual Pg 0 0 0
IV.MSCL.HHZ. 2011-03-16T17:34:22.14 0.3 undecidable manual Pg 49 95.0382 0.249 63
IV.MPAZ.HHN. 2011-03-16T17:34:22.12 0.3 undecidable manual Pg 71 96.3258 0.033 65
IV.AGST.EHN. 2011-03-16T17:34:22.43 0.1 undecidable manual Sg 153 51.6039 0.298 90
IV.HAGA.HHN. 2011-03-16T17:34:21.10 0.1 undecidable manual Sg 159 46.2204 0.412 89
IV.HCRL.HHZ. 2011-03-16T17:34:20.41 0.1 undecidable manual Sg 172 43.7229 0.378 90
IV.MEU.SHZ. 2011-03-16T17:34:20.13 10.0 undecidable manual Pg 0 0 0
IV.HAVL.HHE. 2011-03-16T17:34:19.16 0.1 undecidable manual Pg 170 80.364 -0.471 81
IV.MSRU.HHZ. 2011-03-16T17:34:19.84 0.3 undecidable manual Pg 36 80.8635 0.128 66
IV.MMME.HHZ. 2011-03-16T17:34:19.40 0.1 undecidable manual Sg 41 38.4282 0.73 81
IV.HMDC.HHZ. 2011-03-16T17:34:19.12 0.3 undecidable manual Pg 192 80.8635 -0.588 59
IV.HLNI.HHN. 2011-03-16T17:34:18.32 0.1 undecidable manual Sg 193 36.9297 0.047 97
IV.RAFF.HHZ. 2011-03-16T17:34:18.04 0.1 undecidable manual Pg 227 72.9714 -0.46 83
IV.GALF.HHZ. 2011-03-16T17:34:18.24 0.1 undecidable manual Sg 277 35.3424 0.396 89
IV.MILZ.HHN. 2011-03-16T17:34:17.82 0.6 undecidable manual Pg 19 70.2741 -0.263 44
IV.MNO.SHZ. 2011-03-16T17:34:17.73 10.0 undecidable manual Sg 0 0 0
IV.MPNC.HHZ. 2011-03-16T17:34:16.69 0.3 undecidable manual Pg 33 62.493 -0.193 67
IV.HVZN.HHZ. 2011-03-16T17:34:15.82 0.1 undecidable manual Pg 202 59.1963 -0.562 83
IV.SSY.HHZ. 2011-03-16T17:34:15.94 0.1 undecidable manual Pg 171 57.9975 -0.256 89
IV.AGST.EHN. 2011-03-16T17:34:14.85 0.1 undecidable manual Pg 153 51.6039 -0.376 88
IV.CAGR.HHZ. 2011-03-16T17:34:14.70 0.1 undecidable manual Pg 262 41.3253 1.039 68
IV.MNO.SHZ. 2011-03-16T17:34:13.59 10.0 undecidable manual Pg 0 0 0
IV.HCRL.HHZ. 2011-03-16T17:34:13.53 0.1 undecidable manual Pg 172 43.7229 -0.485 87
IV.HAGA.HHN. 2011-03-16T17:34:13.98 0.1 undecidable manual Pg 159 46.2204 -0.415 88
IV.NOV.HHZ. 2011-03-16T17:34:13.59 0.3 undecidable manual Pg 21 42.0246 -0.182 70
IV.HLNI.HHN. 2011-03-16T17:34:12.22 0.1 undecidable manual Pg 193 36.9297 -0.781 79
IV.GALF.HHZ. 2011-03-16T17:34:12.58 0.1 undecidable manual Pg 277 35.3424 -0.174 95
IV.MMME.HHZ. 2011-03-16T17:34:12.99 0.1 undecidable manual Pg 41 38.4282 -0.24 93
IV.ESLN.HHZ. 2011-03-16T17:34:11.30 0.1 undecidable manual Sg 18 2.3976 0.203 100
IV.ECNV.HHZ. 2011-03-16T17:34:11.04 0.1 undecidable manual Pg 249 23.8539 -0.03 100
IV.ESLN.HHZ. 2011-03-16T17:34:08.45 0.1 undecidable manual Pg 18 2.3976 -0.408 95
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