Earthquake with magnitude of ML 1.7 on date 19-08-2021 and time 09:57:35 (Italy) in region 3 km N Forlì (FC)

A magnitude ML 1.7 earthquake occured in region: 3 km N Forlì (FC), on

  • 19-08-2021 07:57:35 (UTC)
  • 19-08-2021 09:57:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2530, 12.0390 at 21 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
Forlì FC 3 117913 117913
Forlimpopoli FC 10 13290 131203
Castrocaro Terme e Terra del Sole FC 11 6426 137629
Faenza RA 13 58541 196170
Russi RA 13 12247 208417
Bertinoro FC 14 11059 219476
Meldola FC 14 9970 229446
Cotignola RA 17 7474 236920
Predappio FC 17 6346 243266
Dovadola FC 19 1653 244919
Bagnacavallo RA 19 16739 261658
Solarolo RA 20 4488 266146

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km N of Forlì (117913 inhabitants)
13 Km E of Faenza (58541 inhabitants)
21 Km NW of Cesena (96758 inhabitants)
22 Km SW of Ravenna (159116 inhabitants)
28 Km E of Imola (69797 inhabitants)
47 Km W of Rimini (147750 inhabitants)
62 Km E of Bologna (386663 inhabitants)
73 Km SE of Ferrara (133155 inhabitants)
80 Km W of Pesaro (94582 inhabitants)
82 Km NE of Firenze (382808 inhabitants)
86 Km E of Prato (191150 inhabitants)
88 Km NE of Scandicci (50609 inhabitants)
88 Km N of Arezzo (99543 inhabitants)
91 Km NW of Fano (60888 inhabitants)
93 Km S of Rovigo (51867 inhabitants)
96 Km E of Pistoia (90315 inhabitants)
99 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 1.7 2021-08-19
07:57:35
44.2533 12.0387 21 2021-12-29
11:12:32
Bollettino Sismico Italiano INGV 95784441
Reviewed
Rev100
ML 1.6 2021-08-19
07:57:36
44.2265 11.9817 20 2021-08-19
08:13:18
Sala Sismica INGV-Roma 94364721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-19 07:57:35 ± 0.19
Latitude 44.2533 ± 0.0081
Longitude 12.0387 ± 0.0151
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95784441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1009
Semi-minor axis of confidence ellipse (meter) 884
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 257
Circular confidence region, given by single value of horizontal uncertainty (meter) 1010.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 284
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.19695
Epicentral distance of station farthest from the epicenter (degree) 0.56298
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 94364721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-19 08:13:18

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 95784441
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-23 12:22:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2021-08-19T07:57:54.52 0.3 undecidable manual S 223 62.493 101 -0.05 72
IV.SEI.HHZ. 2021-08-19T07:57:53.49 0.6 undecidable manual S 248 58.497 102 -0.03 49
IV.ASQU.HHZ. 2021-08-19T07:57:52.86 0.6 undecidable manual S 202 54.4011 104 0.39 46
IV.VISG.HHZ. 2021-08-19T07:57:51.40 0.3 undecidable manual S 262 48.618 106 0.44 69
IV.SFI.EHZ. 2021-08-19T07:57:49.23 0.3 undecidable manual S 202 41.5251 109 0.06 76
IV.RUFI.EHZ. 2021-08-19T07:57:46.32 0.3 undecidable manual P 223 62.493 101 -0.05 72
IV.LMD.HHZ. 2021-08-19T07:57:46.41 0.3 undecidable manual S 234 32.8449 115 -0.59 67
IV.ASQU.HHZ. 2021-08-19T07:57:45.23 0.1 undecidable manual P 202 54.4011 104 0.08 98
IV.SEI.HHZ. 2021-08-19T07:57:45.83 0.3 undecidable manual P 248 58.497 102 0.07 73
IV.BRIS.HHZ. 2021-08-19T07:57:44.53 0.3 undecidable manual S 262 21.867 127 0.05 78
IV.VISG.HHZ. 2021-08-19T07:57:44.18 0.1 undecidable manual P 262 48.618 106 -0.1 98
IV.MTRZ.HNE. 2021-08-19T07:57:44.07 0.3 undecidable manual P 278 49.2174 105 -0.31 71
IV.SFI.EHZ. 2021-08-19T07:57:43.33 0.1 positive manual P 202 41.5251 109 0.08 100
IV.LMD.HHZ. 2021-08-19T07:57:41.74 0.1 positive manual P 234 32.8449 115 -0.25 98
IV.BRIS.HHZ. 2021-08-19T07:57:40.78 0.1 positive manual P 262 21.867 127 0.24 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHN. ML:2.2 0.0007815789499999999 0.384 AML other m 2021-08-19T07:57:44.81
IV.SFI.EHN. ML:1.8 0.00017549999999999998 0.98 AML other m 2021-08-19T07:57:49.90
IV.SFI.EHE. ML:1.8 0.000188 0.38 AML other m 2021-08-19T07:57:50.24
IV.VISG.HHE. ML:1.4 0.000057999999999999994 1.34 AML other m 2021-08-19T07:57:52.26
IV.VISG.HHN. ML:1.5 0.0000811 0.24 AML other m 2021-08-19T07:57:52.32
IV.ASQU.HHE. ML:1.6 0.00008579999999999998 0.44 AML other m 2021-08-19T07:57:53.38
IV.SEI.HHN. ML:1.8 0.00013637194999999998 1.7152 AML other m 2021-08-19T07:57:53.76
IV.ASQU.HHN. ML:1.3 0.000038954015 0.48 AML other m 2021-08-19T07:57:53.14
IV.SEI.HHE. ML:1.6 0.000085014335 0.3008 AML other m 2021-08-19T07:57:53.72
IV.SFI.HNN. ML:1.8 0.00020010430000000001 0.3008 AML other m 2021-08-19T07:57:50.04
IV.SFI.HNE. ML:1.8 0.00017860565 0.8768 AML other m 2021-08-19T07:57:50.30
IV.RUFI.EHN. ML:1.3 0.000041493395000000005 1.8816 AML other m 2021-08-19T07:57:56.05
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