Earthquake with magnitude of ML 4.6 on date 20-05-2012 and time 19:38:14 (Italy) in region 6 km NW Finale Emilia (MO)

A magnitude ML 4.6 earthquake occured in region: 6 km NW Finale Emilia (MO), on

  • 20-05-2012 17:38:14 (UTC)
  • 20-05-2012 19:38:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.88, 11.25 at 4 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV integrato con i dati della Rete Sismica di emergenza.

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
Finale Emilia MO 6 15699 15699
San Felice sul Panaro MO 10 10900 26599
Bondeno FE 13 14655 41254
Camposanto MO 14 3201 44455
Felonica MN 14 1359 45814
Sant'Agostino FE 14 6853 52667
Sermide MN 15 6189 58856
Medolla MO 15 6308 65164
Mirandola MO 15 23875 89039
Magnacavallo MN 15 1561 90600
Calto RO 15 743 91343
Poggio Rusco MN 15 6625 97968
Castelmassa RO 16 4252 102220
Ficarolo RO 16 2438 104658
San Giovanni del Dosso MN 17 1248 105906
Castelnovo Bariano RO 17 2762 108668
Cento FE 17 35686 144354
Villa Poma MN 17 2023 146377
Mirabello FE 17 3266 149643
Ceneselli RO 18 1719 151362
Carbonara di Po MN 18 1297 152659
Salara RO 18 1160 153819
Cavezzo MO 18 7026 160845
Schivenoglia MN 19 1203 162048
Pieve di Cento BO 19 7019 169067
Borgofranco sul Po MN 19 784 169851
Crevalcore BO 19 13465 183316
Gaiba RO 20 1063 184379

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Ferrara (133155 inhabitants)
31 Km E of Carpi (70699 inhabitants)
37 Km NE of Modena (184973 inhabitants)
43 Km N of Bologna (386663 inhabitants)
47 Km W of Rovigo (51867 inhabitants)
53 Km E of Reggio nell'Emilia (171345 inhabitants)
65 Km SE of Verona (258765 inhabitants)
69 Km NW of Imola (69797 inhabitants)
73 Km E of Parma (192836 inhabitants)
76 Km SW of Padova (210401 inhabitants)
78 Km SW of Vicenza (112953 inhabitants)
83 Km NW of Faenza (58541 inhabitants)
91 Km NW of Ravenna (159116 inhabitants)
96 Km NW of Forlì (117913 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 last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. 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 last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 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 1985

Earthquakes since 1985

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.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. 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

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 adjourned progressively as more data become available. See http://shakemap.rm.ingv.it/ for additional information.

The red star indicates the epicenter. The red triangles show the stations of the INGV Italian National Seismic Network and the blue triangles those of the Nationa Accelerometric Network of the Dipartimento della Protezione Civile.

Intensity Shakemap

Intensity Shakemap

This map shows the distribution of the istrumentally derived intensities. To this purpose, it is used a conversion relation between ground acceleration and velocity, and the Mercalli Modificata (MMI - Modified Mercalli Intensity) scale. In general, the Mercalli intensity scale relies on the effects that the ground shaking produces as reported by an observer.
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap

This map shows This map shows the distribution of peak ground acceleration expressed as per cent 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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
Rev 1000 ML 4.6 2012-05-20
17:38:14
44.88 11.25 4 2014-09-19
08:14:18
Bollettino Sismico Italiano INGV integrato con i dati della Rete Sismica di emergenza 5890491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2012-05-20 17:38:14 ± 0.06
Latitude 44.88 ± 0.00
Longitude 11.25 ± 0.01
Depth (km) 4 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> REMO-INGV
Event type earthquake
Origin ID 5890491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 808
Semi-minor axis of confidence ellipse (meter) 450
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 345
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 112
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.0693
Epicentral distance of station closest to the epicenter (degree) 0.03867
Epicentral distance of station farthest from the epicenter (degree) 0.39031
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:4.6

Field Value
Value 4.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 5890491
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2014-09-18 12:47:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NOVE.EHZ. 2012-05-20T17:38:33.32 1.0 undecidable manual S 258 0.3903 1.73 0.81
IV.NOVE.EHZ. 2012-05-20T17:38:22.83 1.0 undecidable manual P 258 0.3903 -0.21 0.56
IV.RAVA.EHZ. 2012-05-20T17:38:22.91 0.1 negative manual S 218 0.1565 -0.02 0.08
IV.MODE.HNZ. 2012-05-20T17:38:22.24 0.6 negative manual P 221 0.331 -0.05 0.27
IV.FIU.EHZ. 2012-05-20T17:38:21.30 1.0 undecidable manual P 145 0.2932 0.34 0.81
IV.SERM.HNZ. 2012-05-20T17:38:21.98 0.6 negative manual S 13 0.134 0.04 2.18
IV.T0812.EHZ. 2012-05-20T17:38:20.34 0.6 undecidable manual S 326 0.0908 -0.07 0.33
IV.T0811.EHZ. 2012-05-20T17:38:20.26 0.1 positive manual S 191 0.098 0.05 0.08
IV.T0822.EHZ. 2012-05-20T17:38:19.78 0.3 positive manual S 126 0.0809 0.18 0.17
IV.SERM.HNZ. 2012-05-20T17:38:18.03 0.3 negative manual P 13 0.134 -0.05 0.68
IV.RAVA.EHZ. 2012-05-20T17:38:18.58 0.1 negative manual P 218 0.1565 0.01 0.05
IV.T0811.EHZ. 2012-05-20T17:38:17.05 0.1 positive manual P 191 0.098 -0.06 0.05
IV.T0812.EHZ. 2012-05-20T17:38:17.04 0.6 undecidable manual P 326 0.0908 -0.09 0.34
IV.T0813.EHZ. 2012-05-20T17:38:17.88 0.1 positive manual S 267 0.0387 0 0.08
IV.T0822.EHZ. 2012-05-20T17:38:16.86 0.3 positive manual P 126 0.0809 0 0.16
IV.T0813.EHZ. 2012-05-20T17:38:15.96 0.1 positive manual P 267 0.0387 0.02 0.05
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MODE.HNE. ML:4.7 0.197 0.7 AML other m 2012-05-20T17:38:43.66
IV.MODE.HNN. ML:4.7 0.198 1.32 AML other m 2012-05-20T17:38:44.05
IV.TREG.HNE. ML:4.2 0.0265 0.46 AML other m 2012-05-20T17:38:41.33
IV.TREG.HNN. ML:4.4 0.041200001 0.28 AML other m 2012-05-20T17:38:42.98
IV.ZEN8.HNE. ML:4.3 0.02375 1.58 AML other m 2012-05-20T17:38:47.43
IV.ZEN8.HNN. ML:5 0.09875 0.44 AML other m 2012-05-20T17:38:46.20
IV.VOBA.HNE. ML:4.6 0.0366000005 0.2 AML other m 2012-05-20T17:38:49.84
IV.VOBA.HNN. ML:4.7 0.0465 1.02 AML other m 2012-05-20T17:38:48.87
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

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 full SEED format Download