Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 26-08-2021 and time 07:01:42 (UTC) in region 5 km NW Castrocaro Terme e Terra del Sole (FC)

A magnitude ML 1.3 earthquake occured in region: 5 km NW Castrocaro Terme e Terra del Sole (FC), on

  • 26-08-2021 07:01:42 (UTC)
  • 26-08-2021 09:01:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.2050, 11.9020 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.

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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
Castrocaro Terme e Terra del Sole FC 5 6426 6426
Dovadola FC 9 1653 8079
Faenza RA 9 58541 66620
Modigliana FC 10 4560 71180
Brisighella RA 11 7639 78819
Forlì FC 11 117913 196732
Predappio FC 13 6346 203078
Castel Bolognese RA 15 9554 212632
Meldola FC 15 9970 222602
Riolo Terme RA 16 5720 228322
Rocca San Casciano FC 17 1910 230232
Solarolo RA 18 4488 234720
Forlimpopoli FC 18 13290 248010
Tredozio FC 19 1212 249222
Bertinoro FC 20 11059 260281

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km S of Faenza (58541 inhabitants)
11 Km W of Forlì (117913 inhabitants)
22 Km SE of Imola (69797 inhabitants)
28 Km W of Cesena (96758 inhabitants)
34 Km SW of Ravenna (159116 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
55 Km W of Rimini (147750 inhabitants)
71 Km NE of Firenze (382808 inhabitants)
74 Km E of Prato (191150 inhabitants)
74 Km SE of Ferrara (133155 inhabitants)
76 Km NE of Scandicci (50609 inhabitants)
82 Km N of Arezzo (99543 inhabitants)
84 Km E of Pistoia (90315 inhabitants)
87 Km W of Pesaro (94582 inhabitants)
92 Km SE of Modena (184973 inhabitants)
97 Km S of Rovigo (51867 inhabitants)
98 Km W of Fano (60888 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 1.3 2021-08-26
07:01:42		 44.2048 11.9022 21 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97787301
Reviewed
Rev100 		ML 1.3 2021-08-26
07:01:43		 44.2083 11.8965 19 2021-08-26
07:15:02		 Sala Sismica INGV-Roma 94652151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-26 07:01:42 ± 0.46
Latitude 44.2048 ± 0.0207
Longitude 11.9022 ± 0.0238
Depth (km) 21 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97787301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2446
Semi-minor axis of confidence ellipse (meter) 1342
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 42
Circular confidence region, given by single value of horizontal uncertainty (meter) 2450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 260
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.55938
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 97787301
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-25 16:50:32

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 94652151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-26 07:15:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PTRJ.HNZ. 2021-08-26T07:03:33.89 3.0 undecidable manual Sg 10.83 0
IV.ISPIC.HNZ. 2021-08-26T07:03:29.41 3.0 undecidable manual Pn -7.21 0
IV.COLB.HHZ. 2021-08-26T07:03:28.12 3.0 undecidable manual Sn -2.18 0
GU.LSD.HHZ. 2021-08-26T07:03:22.84 3.0 undecidable manual Sg 11.6 0
IV.CRTO.HHZ. 2021-08-26T07:03:21.58 3.0 undecidable manual Sn -9.99 0
IV.CAGR.HHZ. 2021-08-26T07:03:15.51 3.0 undecidable manual Pn -8.75 0
IV.VVLD.HHZ. 2021-08-26T07:03:07.19 3.0 undecidable manual Sg 3.82 0
IV.VIVA.HHZ. 2021-08-26T07:03:00.04 3.0 undecidable manual Sg 1.28 0
IX.RSF3.HHZ.02 2021-08-26T07:03:00.50 3.0 undecidable manual Pg 13.6 0
CR.ZAG.BHZ. 2021-08-26T07:02:43.28 3.0 undecidable manual Pg 6.48 0
MN.TRI.HHZ. 2021-08-26T07:02:40.84 3.0 undecidable manual Sn -5.09 0
IV.TOLF.HHZ. 2021-08-26T07:02:40.29 3.0 undecidable manual Sn -7.13 0
IV.FDMO.HHZ. 2021-08-26T07:02:34.56 3.0 undecidable manual Sg -0.4 0
IV.VIVA.HHZ. 2021-08-26T07:02:31.55 3.0 negative manual Pg 6.76 0
IV.VOBA.EHZ. 2021-08-26T07:02:24.11 3.0 undecidable manual Sn -4.37 0
IV.PP3.EHZ. 2021-08-26T07:02:16.75 3.0 negative manual Pg 4.08 0
IV.PE3.EHZ. 2021-08-26T07:02:09.79 3.0 undecidable manual Sn -6.28 0
IV.CADC.EHZ. 2021-08-26T07:02:09.86 3.0 positive manual Pg 2.38 0
IV.FNVD.HHZ. 2021-08-26T07:02:02.88 0.3 undecidable manual S 266 62.0934 101 0.63 63
IV.SEI.HHZ. 2021-08-26T07:01:58.09 0.3 undecidable manual S 249 46.4202 106 -0.07 71
GU.GSCL.HHZ. 2021-08-26T07:01:58.65 3.0 undecidable manual Sn -3.56 0
IV.MTRZ.HNZ. 2021-08-26T07:01:58.43 0.6 undecidable manual S 288 39.7269 109 1.96 21
IV.VISG.HHZ. 2021-08-26T07:01:55.44 0.3 undecidable manual S 267 37.2294 110 -0.4 67
IV.SFI.EHZ. 2021-08-26T07:01:55.41 0.3 undecidable manual S 188 33.5442 113 0.48 68
IV.FNVD.HHZ. 2021-08-26T07:01:54.15 0.3 undecidable manual P 266 62.0934 101 0.05 71
IV.MTRZ.HNZ. 2021-08-26T07:01:51.16 0.3 undecidable manual P 288 39.7269 109 0.4 69
IV.SEI.HHZ. 2021-08-26T07:01:51.50 0.3 undecidable manual P 249 46.4202 106 -0.24 69
IV.LMD.HHZ. 2021-08-26T07:01:51.74 0.3 undecidable manual S 228 20.9679 128 -0.27 72
IV.BDI.HHZ. 2021-08-26T07:01:51.71 3.0 negative manual P -1.96 0
IV.BRIS.HHZ. 2021-08-26T07:01:50.05 0.3 undecidable manual S 281 10.9779 148 -0.14 75
IV.FIR.HHZ. 2021-08-26T07:01:50.91 3.0 undecidable manual Pn -1.1 0
IV.VISG.HHZ. 2021-08-26T07:01:49.90 0.3 undecidable manual P 267 37.2294 110 -0.5 66
IV.SFI.EHZ. 2021-08-26T07:01:49.95 0.1 undecidable manual P 188 33.5442 113 0.08 98
IV.LMD.HHZ. 2021-08-26T07:01:47.89 0.1 negative manual P 228 20.9679 128 -0.3 96
IV.BRIS.HHZ. 2021-08-26T07:01:46.97 0.1 undecidable manual P 281 10.9779 148 -0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:1.7 0.00029049999999999996 0.2 AML other m 2021-08-26T07:01:51.97
IV.LMD.HHE. ML:1.6 0.0002235 1.78 AML other m 2021-08-26T07:01:52.00
IV.SFI.HNE. ML:1.1 0.00005074362 1.84 AML other m 2021-08-26T07:01:55.99
IV.SFI.EHN. ML:1.1 0.0000486 1.72 AML other m 2021-08-26T07:01:56.87
IV.VISG.HHE. ML:0.9 0.000022825505 0.1792 AML other m 2021-08-26T07:01:56.13
IV.SFI.EHE. ML:1.1 0.00004625 0.38 AML other m 2021-08-26T07:01:56.08
IV.VISG.HHN. ML:1.0 0.00003248251 0.1408 AML other m 2021-08-26T07:01:56.74
IV.SEI.HHN. ML:1.6 0.00011275 1.66 AML other m 2021-08-26T07:01:58.08
IV.SEI.HHE. ML:1.4 0.00006455 0.3 AML other m 2021-08-26T07:02:00.20
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