INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.1 on date 16-07-2017 and time 17:55:28 (Italy) in region Casola Valsenio (RA)

A magnitude ML 2.1 earthquake occured in region: Casola Valsenio (RA), on

  • 16-07-2017 15:55:28 (UTC)
  • 16-07-2017 17:55:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.22, 11.62 at 30 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Casola Valsenio RA 0 2617 2617
Fontanelice BO 6 1943 4560
Borgo Tossignano BO 7 3288 7848
Casalfiumanese BO 8 3438 11286
Castel del Rio BO 9 1246 12532
Riolo Terme RA 10 5720 18252
Brisighella RA 12 7639 25891
Palazzuolo sul Senio FI 14 1154 27045
Dozza BO 15 6652 33697
Modigliana FC 16 4560 38257
Imola BO 16 69797 108054
Marradi FI 16 3139 111193
Castel Bolognese RA 18 9554 120747
Tredozio FC 19 1212 121959
Castel San Pietro Terme BO 20 20811 142770

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km SW of Imola (69797 inhabitants)
22 Km W of Faenza (58541 inhabitants)
34 Km W of Forlì (117913 inhabitants)
37 Km SE of Bologna (386663 inhabitants)
51 Km W of Cesena (96758 inhabitants)
51 Km W of Ravenna (159116 inhabitants)
57 Km NE of Prato (191150 inhabitants)
58 Km NE of Firenze (382808 inhabitants)
62 Km NE of Scandicci (50609 inhabitants)
65 Km E of Pistoia (90315 inhabitants)
68 Km S of Ferrara (133155 inhabitants)
72 Km SE of Modena (184973 inhabitants)
78 Km W of Rimini (147750 inhabitants)
85 Km SE of Carpi (70699 inhabitants)
87 Km N of Arezzo (99543 inhabitants)
95 Km SE of Reggio nell'Emilia (171345 inhabitants)
95 Km S of Rovigo (51867 inhabitants)
99 Km E of Lucca (89046 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
Shakemap
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 2.1 2017-07-16
15:55:28
44.22 11.62 30 2018-07-06
12:40:15
Bollettino Sismico Italiano INGV 50849031
Rev 100 ML 2.0 2017-07-16
15:55:28
44.14 11.61 33 2017-07-16
16:02:45
Sala Sismica INGV-Roma 47953841
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-07-16 15:55:28 ± 0.42
Latitude 44.22 ± 0.02
Longitude 11.62 ± 0.02
Depth (km) 30 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 50849031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1590
Semi-minor axis of confidence ellipse (meter) 989
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 148
Circular confidence region, given by single value of horizontal uncertainty (meter) 1590
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.10432
Epicentral distance of station farthest from the epicenter (degree) 0.62863
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:2

Field Value
Value 2
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 47953841
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-07-16 16:02:45

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 50849031
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-01-25 11:42:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRMI.HNN. 2017-07-16T15:55:51.68 0.6 undecidable manual S 227 0.6286 108 0.79 39
IV.MPPT.EHN. 2017-07-16T15:55:46.43 0.3 undecidable manual S 235 0.4649 115 0.08 74
IV.MTCR.EHZ. 2017-07-16T15:55:46.71 0.3 undecidable manual S 246 0.4847 114 -0.19 70
IV.RUFI.EHZ. 2017-07-16T15:55:44.91 0.3 undecidable manual S 192 0.3939 119 0.43 68
IV.MOCL.EHZ. 2017-07-16T15:55:44.32 0.3 undecidable manual S 235 0.384 120 0.09 75
IV.FNVD.HHZ. 2017-07-16T15:55:43.12 0.3 undecidable manual S 261 0.3615 122 -0.53 65
IV.CRMI.HNN. 2017-07-16T15:55:42.33 0.3 undecidable manual P 227 0.6286 108 0.69 60
IV.IMOL.EHZ. 2017-07-16T15:55:40.78 0.3 undecidable manual S 33 0.161 146 1.46 46
IV.MPPT.EHN. 2017-07-16T15:55:39.00 0.3 undecidable manual P 235 0.4649 115 -0.01 74
IV.MTRZ.HHZ. 2017-07-16T15:55:39.95 0.3 undecidable manual S 302 0.1664 145 0.55 72
IV.MTCR.EHZ. 2017-07-16T15:55:39.11 0.3 undecidable manual P 246 0.4847 114 -0.22 70
IV.BRIS.HHZ. 2017-07-16T15:55:38.32 0.3 undecidable manual S 89 0.1043 157 -0.19 77
IV.RUFI.EHZ. 2017-07-16T15:55:38.18 0.3 undecidable manual P 192 0.3939 119 0.25 71
IV.LMD.HHZ. 2017-07-16T15:55:38.68 0.6 undecidable manual S 157 0.1583 147 -0.59 47
IV.MOCL.EHZ. 2017-07-16T15:55:37.70 0.3 undecidable manual P 235 0.384 120 -0.09 74
IV.FNVD.HHZ. 2017-07-16T15:55:36.87 0.3 undecidable manual P 261 0.3615 122 -0.58 65
IV.IMOL.EHZ. 2017-07-16T15:55:35.47 0.3 undecidable manual P 33 0.161 146 0.52 71
IV.MTRZ.HHZ. 2017-07-16T15:55:34.81 0.1 undecidable manual P 302 0.1664 145 -0.19 100
IV.BRIS.HHZ. 2017-07-16T15:55:34.06 0.1 positive manual P 89 0.1043 157 -0.43 98
IV.LMD.HHZ. 2017-07-16T15:55:34.24 0.1 undecidable manual P 157 0.1583 147 -0.69 89
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMOL.HNE. ML:1.8 0.00030169545 0.0512 AML other m 2017-07-16T15:55:34.69
IV.RIBO.EHE.01 ML:0 5.3441125E-5 0.128 AML other m 2017-07-16T15:55:35.72
IV.BRIS.HHE. ML:2.1 0.00055194775 0.192 AML other m 2017-07-16T15:55:38.79
IV.BRIS.HNE. ML:2 0.00049885445 0.2048 AML other m 2017-07-16T15:55:38.89
IV.BRIS.HNN. ML:2.3 0.0009852941 0.32 AML other m 2017-07-16T15:55:38.95
IV.BRIS.HHN. ML:2.3 0.0010185171 0.3456 AML other m 2017-07-16T15:55:38.94
IV.LMD.HHN. ML:2 0.0003810047 0.192 AML other m 2017-07-16T15:55:39.34
IV.LMD.HHE. ML:2.1 0.0005341493 0.2048 AML other m 2017-07-16T15:55:39.54
IV.MTRZ.HNE. ML:2.4 0.00113359 0.2048 AML other m 2017-07-16T15:55:41.24
IV.MTRZ.HHE. ML:2.5 0.001206538 0.2176 AML other m 2017-07-16T15:55:41.24
IV.MTRZ.HNN. ML:2.5 0.001213602 0.6016 AML other m 2017-07-16T15:55:41.71
IV.MTRZ.HHN. ML:2.5 0.0012484195 0.6016 AML other m 2017-07-16T15:55:41.71
IV.FNVD.HHN. ML:1.9 0.000231323625 0.192 AML other m 2017-07-16T15:55:43.69
IV.FNVD.HHE. ML:1.8 0.0001582402 0.6016 AML other m 2017-07-16T15:55:45.45
IV.IMOL.HNN. ML:1.6 0.000166166445 0.5376 AML other m 2017-07-16T15:55:49.64
IV.VOBA.HNN. ML:0 7.587171E-5 0.0768 AML other m 2017-07-16T15:55:54.39
IV.VOBA.HNE. ML:0 0.000117768595 0.1024 AML other m 2017-07-16T15:55:58.44
RD.PGF.BHE. ML:0 2.789476E-5 1.6768 AML other m 2017-07-16T15:56:06.54
SI.RISI.HHE. ML:0 2.013889E-5 0.2176 AML other m 2017-07-16T15:56:21.11
RD.PGF.BHN. ML:0 4.8636045E-5 1.6 AML other m 2017-07-16T15:56:27.32
SI.RISI.HHN. ML:0 3.321645E-5 0.1152 AML other m 2017-07-16T15:56:55.99
IV.MRB1.HHN. ML:0 9.75451E-5 0.192 AML other m 2017-07-16T15:56:58.41
IV.MRB1.HNE. ML:0 0.00011068246 0.32 AML other m 2017-07-16T15:57:05.00
IV.MRB1.HHE. ML:0 8.3169375E-5 0.1152 AML other m 2017-07-16T15:57:13.16
IV.MTMR.EHN. ML:0 0.000102190645 1.6512 AML other m 2017-07-16T15:57:28.10
IV.MRB1.HNN. ML:0 0.00022240195 0.576 AML other m 2017-07-16T15:57:30.20
IV.MTMR.EHE. ML:0 0.00010135269 1.7024 AML other m 2017-07-16T15:57:38.34
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://cnt.rm.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