Earthquake with magnitude of ML 0.8 on date 01-09-2021 and time 04:44:49 (Italy) in region 1 km NW Premilcuore (FC)

A magnitude ML 0.8 earthquake occured in region: 1 km NW Premilcuore (FC), on

  • 01-09-2021 02:44:49 (UTC)
  • 01-09-2021 04:44:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.986, 11.768 at 7 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Premilcuore FC 1 799 799
Portico e San Benedetto FC 5 756 1555
Rocca San Casciano FC 10 1910 3465
Tredozio FC 11 1212 4677
Galeata FC 12 2516 7193
Santa Sofia FC 12 4136 11329
San Godenzo FI 14 1167 12496
Civitella di Romagna FC 14 3786 16282
Marradi FI 16 3139 19421
Dovadola FC 18 1653 21074
Modigliana FC 19 4560 25634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km SW of Forlì (117913 inhabitants)
35 Km S of Faenza (58541 inhabitants)
41 Km S of Imola (69797 inhabitants)
42 Km W of Cesena (96758 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
53 Km E of Scandicci (50609 inhabitants)
55 Km E of Prato (191150 inhabitants)
58 Km N of Arezzo (99543 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
64 Km W of Rimini (147750 inhabitants)
66 Km SE of Bologna (386663 inhabitants)
68 Km E of Pistoia (90315 inhabitants)
82 Km NE of Siena (53903 inhabitants)
92 Km W of Pesaro (94582 inhabitants)
95 Km S of Ferrara (133155 inhabitants)
99 Km SE of Modena (184973 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.8 2021-09-01
02:44:49
43.9857 11.7677 7 2021-09-01
02:49:27
Sala Sismica INGV-Roma 94893711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-01 02:44:49 ± 0.18
Latitude 43.9857 ± 0.0036
Longitude 11.7677 ± 0.0075
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94893711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 522
Semi-minor axis of confidence ellipse (meter) 281
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 249
Circular confidence region, given by single value of horizontal uncertainty (meter) 520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 145
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.30217
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 94893711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-01 02:49:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SEI.HHZ. 2021-09-01T02:45:01.15 0.3 undecidable manual S 283 0.3022 101 0.26 69
IV.BRIS.HHZ. 2021-09-01T02:44:59.16 0.6 undecidable manual S 360 0.2383 104 0.64 42
IV.RUFI.EHZ. 2021-09-01T02:44:58.64 0.3 undecidable manual S 232 0.2374 104 0.18 71
IV.ASQU.HHZ. 2021-09-01T02:44:56.79 0.3 undecidable manual S 175 0.1898 108 0.1 73
IV.SEI.HHZ. 2021-09-01T02:44:55.57 0.1 undecidable manual P 283 0.3022 101 -0.31 91
IV.RUFI.EHZ. 2021-09-01T02:44:54.41 0.1 undecidable manual P 232 0.2374 104 -0.07 96
IV.BRIS.HHZ. 2021-09-01T02:44:54.53 0.1 undecidable manual P 360 0.2383 104 0.02 97
IV.LMD.HHZ. 2021-09-01T02:44:53.44 0.1 undecidable manual S 335 0.1016 121 -0.14 98
IV.SFI.EHZ. 2021-09-01T02:44:53.52 0.1 undecidable manual S 145 0.0989 121 0.02 100
IV.ASQU.HHZ. 2021-09-01T02:44:53.42 0.1 undecidable manual P 175 0.1898 108 -0.04 98
IV.LMD.HHZ. 2021-09-01T02:44:51.51 0.1 undecidable manual P 335 0.1016 121 -0.15 97
IV.SFI.EHZ. 2021-09-01T02:44:51.58 0.1 undecidable manual P 145 0.0989 121 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.7 7.63E-5 0.4 AML other m 2021-09-01T02:44:53.64
IV.SFI.EHN. ML:0.7 7.5E-5 0.4 AML other m 2021-09-01T02:44:53.65
IV.LMD.HHN. ML:0.7 7.525E-5 0.28 AML other m 2021-09-01T02:44:53.67
IV.SFI.EHE. ML:0.9 0.0001154 0.1 AML other m 2021-09-01T02:44:53.70
IV.ASQU.HHE. ML:0.7 3.995E-5 0.18 AML other m 2021-09-01T02:44:57.27
IV.ASQU.HHN. ML:0.4 1.955E-5 0.36 AML other m 2021-09-01T02:44:59.63
IV.BRIS.HHE. ML:1.1 7.025E-5 0.36 AML other m 2021-09-01T02:44:59.46
IV.BRIS.HHN. ML:1 6.665E-5 0.78 AML other m 2021-09-01T02:45:00.57
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