Earthquake with magnitude of ML 1.1 on date 20-09-2023 and time 21:12:22 (UTC) in region 4 km E Marradi (FI)
A magnitude ML 1.1 earthquake occured in region: 4 km E Marradi (FI), on
- 20-09-2023 21:12:22 (UTC)
- 20-09-2023 23:12:22 (UTC +02:00) Italian time
and geographic coordinates (lat, lon) 44.0840, 11.6670 at 6 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.
Display location by
GeoHack
GoogleMap
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Municipalities within 20 km from the epicenter
Distances are determinated based on the geographic coordintes of the (Istat).
| Municipality | Region | Distance (km) | Inhabitants | Cumulative Inhabitants |
|---|---|---|---|---|
| Marradi | FI | 4 | 3139 | 3139 |
| Tredozio | FC | 6 | 1212 | 4351 |
| Palazzuolo sul Senio | FI | 10 | 1154 | 5505 |
| Portico e San Benedetto | FC | 11 | 756 | 6261 |
| Modigliana | FC | 13 | 4560 | 10821 |
| Rocca San Casciano | FC | 14 | 1910 | 12731 |
| Premilcuore | FC | 15 | 799 | 13530 |
| Casola Valsenio | RA | 16 | 2617 | 16147 |
| Brisighella | RA | 17 | 7639 | 23786 |
| San Godenzo | FI | 18 | 1167 | 24953 |
| Dovadola | FC | 18 | 1653 | 26606 |
| Castel del Rio | BO | 19 | 1246 | 27852 |
Municipalities with at least 50000 inhabitants
An earthquake occurred to
28 Km SW of Faenza (58541 inhabitants)
30 Km S of Imola (69797 inhabitants)
34 Km W of Forlì (117913 inhabitants)
46 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
53 Km SE of Bologna (386663 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
71 Km N of Arezzo (99543 inhabitants)
72 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
86 Km SE of Modena (184973 inhabitants)
89 Km NE of Siena (53903 inhabitants)
97 Km E of Lucca (89046 inhabitants)
100 Km SE of Carpi (70699 inhabitants)
Recent and historical seismicity
Not available maps for this sismic event.
Seismic hazard
Not available maps for this sismic event.
Shakemap
Not available maps for this sismic event.
Felt maps
Not available maps for this sismic event.
Locations history
| Type | Magnitude | Date and Time (UTC) | Latitude | Longitude | Depth (km) | Published time (UTC) | Author | Location ID |
|---|---|---|---|---|---|---|---|---|
|
Reviewed Rev100 |
ML 1.1 | 2023-09-20 21:12:22 |
44.0838 | 11.6673 | 6 | 2023-09-20 21:45:18 |
Sala Sismica INGV-Roma | 121287781 |
Preferred location and magnitude until now.
Origin information
Origin
| Field | Value |
|---|---|
| Time (UTC) | 2023-09-20 21:12:22 ± 0.12 |
| Latitude | 44.0838 ± 0.0036 |
| Longitude | 11.6673 ± 0.0038 |
| Depth (km) | 6 ± 1 (from location) |
| Evaluation mode of Origin | manual |
| Evaluation status of Origin | reviewed |
| Version | 100 -> SURVEY-INGV |
| Event type | earthquake |
| Origin ID | 121287781 |
Uncertainty
| Field | Value |
|---|---|
| Preferred uncertainty description | uncertainty ellipse |
| Semi-major axis of confidence ellipse (meter) | 388 |
| Semi-minor axis of confidence ellipse (meter) | 231 |
| Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) | 207 |
| Circular confidence region, given by single value of horizontal uncertainty (meter) | 390.0 |
| Confidence level of the uncertainty (%) | 68 |
Quality
| Field | Value |
|---|---|
| Largest azimuthal gap in station distribution as seen from epicenter (degree) | 161 |
| Number of associated phases, regardless of their use for origin computation | 18 |
| Number of defining phases | 18 |
| RMS of the travel time residuals of the arrivals used for the origin computation (sec) | 0.14 |
| Epicentral distance of station closest to the epicenter (degree) | 0.02968 |
| Epicentral distance of station farthest from the epicenter (degree) | 0.27070 |
| Number of stations at which the event was observed | 9 |
| Number of stations from which data was used for origin computation | 9 |
Magnitude information
ML:1.1
| Field | Value |
|---|---|
| Value | 1.1 |
| Uncertainty | 0.5 |
| Num. used stations | 4 |
| Type of magnitude | ML |
| Reference to an origin | 121287781 |
| Agency | INGV |
| Autore | Sala Sismica INGV-Roma |
| Time of creation (UTC) | 2023-09-20 21:45:18 |
Picking and Arrival
| SCNL | Time | Uncertainty | Polarity | Evaluation_mode | Phase | Azimuth | Distance(km) | Takeoff_angle | Residual | Weight |
|---|---|---|---|---|---|---|---|---|---|---|
| IV.BOSL.HHZ. | 2023-09-20T21:12:32.67 | 0.6 | undecidable | manual | S | 234 | 28.8489 | 102 | 0.14 | 47 |
| IV.RUFI.EHZ. | 2023-09-20T21:12:32.66 | 0.6 | undecidable | manual | S | 205 | 30.0477 | 101 | -0.27 | 46 |
| IV.SFI.EHZ. | 2023-09-20T21:12:31.41 | 0.6 | undecidable | manual | S | 144 | 24.4533 | 104 | 0.36 | 45 |
| IV.SEI.HHZ. | 2023-09-20T21:12:31.20 | 0.6 | undecidable | manual | S | 263 | 24.8529 | 104 | 0.04 | 48 |
| IV.VISG.HHZ. | 2023-09-20T21:12:30.47 | 0.6 | undecidable | manual | S | 302 | 21.9669 | 106 | 0.28 | 46 |
| IV.RINC.EHZ. | 2023-09-20T21:12:30.41 | 0.6 | undecidable | manual | S | 192 | 22.4553 | 105 | 0.05 | 48 |
| IV.VMGN.HHZ. | 2023-09-20T21:12:28.99 | 0.6 | undecidable | manual | S | 217 | 17.9709 | 109 | 0.13 | 48 |
| IV.BOSL.HHZ. | 2023-09-20T21:12:28.13 | 0.6 | undecidable | manual | P | 234 | 28.8489 | 102 | -0.07 | 48 |
| IV.RUFI.EHZ. | 2023-09-20T21:12:28.17 | 0.3 | positive | manual | P | 205 | 30.0477 | 101 | -0.26 | 68 |
| IV.RINC.EHZ. | 2023-09-20T21:12:27.11 | 0.3 | negative | manual | P | 192 | 22.4553 | 105 | 0.16 | 71 |
| IV.SFI.EHZ. | 2023-09-20T21:12:27.25 | 0.1 | undecidable | manual | P | 144 | 24.4533 | 104 | -0.1 | 95 |
| IV.SEI.HHZ. | 2023-09-20T21:12:27.22 | 0.1 | positive | manual | P | 263 | 24.8529 | 104 | -0.19 | 93 |
| IV.VMGN.HHZ. | 2023-09-20T21:12:26.27 | 0.3 | positive | manual | P | 217 | 17.9709 | 109 | 0.19 | 71 |
| IV.VISG.HHZ. | 2023-09-20T21:12:26.89 | 1.0 | positive | manual | P | 302 | 21.9669 | 106 | 0.04 | 24 |
| IT.MRR.HGE. | 2023-09-20T21:12:25.09 | 0.6 | undecidable | manual | S | 247 | 5.5944 | 138 | -0.06 | 50 |
| IV.LMD.HHZ. | 2023-09-20T21:12:24.61 | 0.6 | undecidable | manual | S | 103 | 3.2967 | 152 | -0.08 | 50 |
| IV.LMD.HHZ. | 2023-09-20T21:12:23.63 | 1.0 | undecidable | manual | P | 103 | 3.2967 | 152 | -0.04 | 25 |
| IT.MRR.HGE. | 2023-09-20T21:12:23.92 | 0.1 | undecidable | manual | P | 247 | 5.5944 | 138 | -0.02 | 100 |
Station Magnitude and Amplitude
| SCNL | mag | Generic_amplitude | Period | Type | Category | Unit | Time_window_reference |
|---|---|---|---|---|---|---|---|
| IV.VISG.HHE. | ML:0.5 | 0.000025450000000000002 | 0.14 | AML | other | m | 2023-09-20T21:12:30.48 |
| IV.SEI.HHE. | ML:1.4 | 0.0001615 | 0.24 | AML | other | m | 2023-09-20T21:12:31.52 |
| IV.SEI.HHN. | ML:1.7 | 0.00029949999999999996 | 0.26 | AML | other | m | 2023-09-20T21:12:31.87 |
| IV.VISG.HHN. | ML:0.6 | 0.00002825 | 0.4 | AML | other | m | 2023-09-20T21:12:33.41 |
TDMT - Time Domain Moment Tensor
Not available TDMT solution for this seismic event.
Fault Plane solutions in the area
Not available maps for this sismic event.