Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 18-05-2015 and time 22:48:44 (Italy) in region 5 km W Forlì (FC)

A magnitude ML 1.6 earthquake occured in region: 5 km W Forlì (FC), on

  • 18-05-2015 20:48:44 (UTC)
  • 18-05-2015 22:48:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2390, 11.9820 at 25 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
Forlì FC 5 117913 117913
Castrocaro Terme e Terra del Sole FC 7 6426 124339
Faenza RA 9 58541 182880
Forlimpopoli FC 13 13290 196170
Meldola FC 14 9970 206140
Dovadola FC 15 1653 207793
Predappio FC 15 6346 214139
Russi RA 16 12247 226386
Bertinoro FC 16 11059 237445
Cotignola RA 17 7474 244919
Brisighella RA 17 7639 252558
Castel Bolognese RA 17 9554 262112
Solarolo RA 17 4488 266600
Modigliana FC 18 4560 271160
Bagnacavallo RA 20 16739 287899

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km W of Forlì (117913 inhabitants)
9 Km SE of Faenza (58541 inhabitants)
24 Km W of Cesena (96758 inhabitants)
25 Km SE of Imola (69797 inhabitants)
26 Km SW of Ravenna (159116 inhabitants)
51 Km W of Rimini (147750 inhabitants)
58 Km E of Bologna (386663 inhabitants)
72 Km SE of Ferrara (133155 inhabitants)
78 Km NE of Firenze (382808 inhabitants)
81 Km E of Prato (191150 inhabitants)
83 Km W of Pesaro (94582 inhabitants)
83 Km NE of Scandicci (50609 inhabitants)
86 Km N of Arezzo (99543 inhabitants)
91 Km E of Pistoia (90315 inhabitants)
94 Km S of Rovigo (51867 inhabitants)
94 Km W of Fano (60888 inhabitants)
95 Km E of Modena (184973 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.6 2015-05-18
20:48:44		 44.239 11.9818 25 2016-01-08
08:44:50		 Bollettino Sismico Italiano INGV 22358721
Reviewed
Rev100 		ML 1.4 2015-05-18
20:48:47		 44.1802 11.8308 5 2015-05-18
21:10:56		 Sala Sismica INGV-Roma 19202651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-05-18 20:48:44 ± 0.31
Latitude 44.2390 ± 0.0081
Longitude 11.9818 ± 0.0163
Depth (km) 25 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 22358721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1241
Semi-minor axis of confidence ellipse (meter) 441
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 263
Circular confidence region, given by single value of horizontal uncertainty (meter) 1240.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 237
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 3.37246
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 22358721
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-11-20 15:19:22

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 19202651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2015-05-18 21:10:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MRB1.HHZ. 2015-05-18T20:50:07.99 3.0 undecidable manual Sn 374.3475 1.78 0
IV.EUCT.HNZ. 2015-05-18T20:50:16.99 3.0 undecidable manual Sg 13.15 0
SI.MOSI.HHZ. 2015-05-18T20:49:59.99 3.0 undecidable manual Sg 0.91 0
GU.TRAV.HHZ. 2015-05-18T20:49:45.99 3.0 undecidable manual Pg 9.92 0
IV.CELI.HHZ. 2015-05-18T20:49:45.95 3.0 negative manual Pn -5.38 0
IV.VIVA.HHZ. 2015-05-18T20:49:43.99 3.0 undecidable manual Sn -4.62 0
IV.FAGN.HHZ. 2015-05-18T20:49:31.99 3.0 undecidable manual Sn -2.64 0
IV.SACS.HHZ. 2015-05-18T20:49:27.99 3.0 undecidable manual Sn -2.4 0
IV.FNVD.HHZ. 2015-05-18T20:49:06.54 0.6 undecidable manual S 264 68.7756 104 0.39 43
IV.RUFI.EHZ. 2015-05-18T20:49:03.48 0.3 undecidable manual S 220 58.2972 107 0.03 71
IV.ASQU.HHZ. 2015-05-18T20:49:02.24 0.3 undecidable manual S 197 51.4152 109 0.54 65
IV.SEI.HHZ. 2015-05-18T20:49:01.66 0.6 undecidable manual S 248 53.7018 108 -0.62 40
IV.SFI.EHZ. 2015-05-18T20:48:58.69 0.3 undecidable manual S 196 38.628 116 0.15 72
IV.FNVD.HHZ. 2015-05-18T20:48:57.22 0.1 undecidable manual P 264 68.7756 104 0.05 91
IV.CRE.HHZ. 2015-05-18T20:48:57.92 0.3 undecidable manual P 182 68.8755 104 0.74 57
IV.IMOL.EHZ. 2015-05-18T20:48:55.57 0.6 undecidable manual S 305 23.2545 132 0.46 45
IV.RUFI.EHZ. 2015-05-18T20:48:55.15 0.3 undecidable manual P 220 58.2972 107 -0.46 64
IV.SEI.HHZ. 2015-05-18T20:48:54.41 0.1 undecidable manual P 248 53.7018 108 -0.52 85
IV.ASQU.HHZ. 2015-05-18T20:48:54.49 0.1 undecidable manual P 197 51.4152 109 -0.11 94
IV.FAEN.HNE. 2015-05-18T20:48:53.03 0.3 undecidable manual S 304 10.0788 155 0.05 76
IV.MTRZ.HHZ. 2015-05-18T20:48:53.95 0.3 undecidable manual P 281 45.0216 112 0.28 68
IV.SFI.EHZ. 2015-05-18T20:48:52.64 0.1 undecidable manual P 196 38.628 116 -0.13 95
IV.IMOL.EHZ. 2015-05-18T20:48:50.77 0.1 undecidable manual P 305 23.2545 132 -0.02 100
IV.FAEN.HNE. 2015-05-18T20:48:49.27 0.1 undecidable manual P 304 10.0788 155 -0.29 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASQU.HHE. ML:1.5 0.00007394999999999998 0.32 AML other m 2015-05-18T20:49:03.90
IV.ASQU.HHN. ML:1.4 0.00005785 0.44 AML other m 2015-05-18T20:49:03.57
IV.CRE.HHE. ML:1.3 0.00002925 0.44 AML other m 2015-05-18T20:49:09.53
IV.CRE.HHN. ML:1.3 0.00003225 1.2 AML other m 2015-05-18T20:49:10.15
IV.SEI.HHE. ML:1.8 0.0001255 0.62 AML other m 2015-05-18T20:49:02.24
IV.SEI.HHN. ML:1.9 0.00016599999999999997 0.28 AML other m 2015-05-18T20:49:03.48
IV.SFI.EHE. ML:1.8 0.00016805 0.42 AML other m 2015-05-18T20:48:59.10
IV.SFI.EHN. ML:1.8 0.00020950000000000002 0.16 AML other m 2015-05-18T20:48:59.21
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download