Earthquake with magnitude of ML 1.8 on date 18-09-2021 and time 08:03:32 (Italy) in region 6 km S Montieri (GR)
A magnitude ML 1.8 earthquake occured in region: 6 km S Montieri (GR), on
- 18-09-2021 06:03:32 (UTC)
- 18-09-2021 08:03:32 (UTC +02:00) Italian time
and geographic coordinates (lat, lon) 43.0740, 11.0190 at 11 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.
Display location by
GeoHack
GoogleMap
OpenStreetMap
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 |
|---|---|---|---|---|
| Montieri | GR | 6 | 1204 | 1204 |
| Chiusdino | SI | 11 | 1903 | 3107 |
| Massa Marittima | GR | 11 | 8375 | 11482 |
| Roccastrada | GR | 14 | 9199 | 20681 |
| Monticiano | SI | 15 | 1571 | 22252 |
| Monterotondo Marittimo | GR | 15 | 1371 | 23623 |
| Castelnuovo di Val di Cecina | PI | 17 | 2231 | 25854 |
| Gavorrano | GR | 19 | 8580 | 34434 |
Municipalities with at least 50000 inhabitants
An earthquake occurred to
36 Km N of Grosseto (82087 inhabitants)
37 Km SW of Siena (53903 inhabitants)
77 Km S of Scandicci (50609 inhabitants)
78 Km SE of Livorno (159219 inhabitants)
80 Km S of Firenze (382808 inhabitants)
83 Km SW of Arezzo (99543 inhabitants)
87 Km SE of Pisa (89158 inhabitants)
90 Km S of Prato (191150 inhabitants)
95 Km SE of Lucca (89046 inhabitants)
96 Km S of Pistoia (90315 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 |
|---|---|---|---|---|---|---|---|---|
|
Bulletin Rev1000 |
ML 1.8 | 2021-09-18 06:03:32 |
43.0745 | 11.0192 | 11 | 2022-03-30 13:04:07 |
Bollettino Sismico Italiano INGV | 95691351 |
|
Reviewed Rev100 |
ML 1.8 | 2021-09-18 06:03:32 |
43.0763 | 11.0158 | 11 | 2021-09-18 06:13:36 |
Sala Sismica INGV-Roma | 95574321 |
Preferred location and magnitude until now.
Origin information
Origin
| Field | Value |
|---|---|
| Time (UTC) | 2021-09-18 06:03:32 ± 0.12 |
| Latitude | 43.0745 ± 0.0063 |
| Longitude | 11.0192 ± 0.0098 |
| Depth (km) | 11 ± 1 (from location) |
| Evaluation mode of Origin | manual |
| Evaluation status of Origin | reviewed |
| Version | 1000 -> BULLETIN-INGV |
| Event type | earthquake |
| Origin ID | 95691351 |
Uncertainty
| Field | Value |
|---|---|
| Preferred uncertainty description | uncertainty ellipse |
| Semi-major axis of confidence ellipse (meter) | 782 |
| Semi-minor axis of confidence ellipse (meter) | 602 |
| Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) | 260 |
| Circular confidence region, given by single value of horizontal uncertainty (meter) | 780.0 |
| Confidence level of the uncertainty (%) | 68 |
Quality
| Field | Value |
|---|---|
| Largest azimuthal gap in station distribution as seen from epicenter (degree) | 81 |
| Number of associated phases, regardless of their use for origin computation | 21 |
| Number of defining phases | 21 |
| RMS of the travel time residuals of the arrivals used for the origin computation (sec) | 0.45 |
| Epicentral distance of station closest to the epicenter (degree) | 0.09443 |
| Epicentral distance of station farthest from the epicenter (degree) | 0.85975 |
| Number of stations at which the event was observed | 11 |
| Number of stations from which data was used for origin computation | 11 |
Magnitudes information
ML:1.8
| Field | Value |
|---|---|
| Value | 1.8 |
| Uncertainty | 0.2 |
| Num. used stations | 8 |
| Type of magnitude | ML |
| Reference to an origin | 95691351 |
| Agency | INGV |
| Autore | Bollettino Sismico Italiano INGV |
| Time of creation (UTC) | 2022-03-01 15:27:23 |
ML:1.8
| Field | Value |
|---|---|
| Value | 1.8 |
| Uncertainty | 0.1 |
| Num. used stations | 6 |
| Type of magnitude | ML |
| Reference to an origin | 95574321 |
| Agency | INGV |
| Autore | Sala Sismica INGV-Roma |
| Time of creation (UTC) | 2021-09-18 06:13:36 |
Picking and Arrival
| SCNL | Time | Uncertainty | Polarity | Evaluation_mode | Phase | Azimuth | Distance(km) | Takeoff_angle | Residual | Weight |
|---|---|---|---|---|---|---|---|---|---|---|
| TV.SF14.HHZ. | 2021-09-18T06:03:50.07 | 0.1 | undecidable | manual | S | 126 | 59.9955 | 50 | -0.59 | 83 |
| TV.SF04.EHZ. | 2021-09-18T06:03:49.36 | 0.3 | undecidable | manual | S | 117 | 58.3971 | 50 | -0.89 | 55 |
| IV.OSSC.HHE. | 2021-09-18T06:03:48.86 | 0.3 | undecidable | manual | S | 20 | 53.1024 | 50 | 0.04 | 72 |
| Z3.A317A.HHE. | 2021-09-18T06:03:48.00 | 0.6 | undecidable | manual | P | 269 | 95.4378 | 50 | -0.28 | 42 |
| IV.CSNT.HHZ. | 2021-09-18T06:03:47.72 | 0.3 | undecidable | manual | S | 26 | 49.3173 | 50 | -0.1 | 71 |
| IV.ARCI.HHZ. | 2021-09-18T06:03:46.05 | 0.1 | undecidable | manual | S | 124 | 44.5221 | 50 | -0.49 | 88 |
| TV.SF04.EHZ. | 2021-09-18T06:03:43.22 | 0.1 | undecidable | manual | P | 117 | 58.3971 | 50 | 0.64 | 81 |
| TV.SF14.HHZ. | 2021-09-18T06:03:43.50 | 0.1 | undecidable | manual | P | 126 | 59.9955 | 50 | 0.68 | 80 |
| IV.CASP.HHZ. | 2021-09-18T06:03:43.42 | 0.1 | undecidable | manual | S | 202 | 33.8439 | 50 | -0.27 | 94 |
| IV.MAGO.CHZ. | 2021-09-18T06:03:43.78 | 0.1 | undecidable | manual | S | 307 | 36.6411 | 50 | -0.65 | 84 |
| IV.OSSC.HHE. | 2021-09-18T06:03:42.33 | 0.1 | undecidable | manual | P | 20 | 53.1024 | 50 | 0.57 | 84 |
| IV.CSNT.HHZ. | 2021-09-18T06:03:41.62 | 0.1 | undecidable | manual | P | 26 | 49.3173 | 50 | 0.44 | 88 |
| IV.ARCI.HHZ. | 2021-09-18T06:03:40.81 | 0.1 | undecidable | manual | P | 124 | 44.5221 | 50 | 0.37 | 90 |
| IV.CASP.HHZ. | 2021-09-18T06:03:39.18 | 0.3 | undecidable | manual | P | 202 | 33.8439 | 50 | 0.38 | 69 |
| IV.MAGO.CHZ. | 2021-09-18T06:03:39.57 | 0.1 | undecidable | manual | P | 307 | 36.6411 | 50 | 0.35 | 92 |
| IV.RIBO.EHZ.01 | 2021-09-18T06:03:38.11 | 0.3 | undecidable | manual | S | 171 | 14.0748 | 127 | -0.13 | 75 |
| IV.FROS.CHZ. | 2021-09-18T06:03:38.92 | 0.1 | undecidable | manual | S | 36 | 18.6702 | 120 | -0.64 | 87 |
| IV.FROS.CHZ. | 2021-09-18T06:03:36.54 | 0.1 | negative | manual | P | 36 | 18.6702 | 120 | 0.13 | 100 |
| IV.TRIF.CHZ. | 2021-09-18T06:03:36.85 | 0.3 | undecidable | manual | S | 295 | 10.4784 | 136 | -0.44 | 95 |
| IV.TRIF.CHZ. | 2021-09-18T06:03:35.28 | 0.1 | undecidable | manual | P | 295 | 10.4784 | 136 | 0.18 | 100 |
| IV.RIBO.EHZ.01 | 2021-09-18T06:03:35.92 | 0.1 | undecidable | manual | P | 171 | 14.0748 | 127 | 0.27 | 98 |
Station Magnitude and Amplitude
| SCNL | mag | Generic_amplitude | Period | Type | Category | Unit | Time_window_reference |
|---|---|---|---|---|---|---|---|
| IV.TRIF.CHN. | ML:2.1 | 0.0014399999999999999 | 1.76 | AML | other | m | 2021-09-18T06:03:37.88 |
| IV.TRIF.CHE. | ML:2.0 | 0.001335 | 1.06 | AML | other | m | 2021-09-18T06:03:37.88 |
| IV.FROS.CHE. | ML:1.8 | 0.000576 | 0.2 | AML | other | m | 2021-09-18T06:03:39.27 |
| IV.FROS.CHN. | ML:1.9 | 0.000624 | 0.32 | AML | other | m | 2021-09-18T06:03:39.47 |
| IV.CASP.HHE. | ML:1.8 | 0.00026549999999999995 | 0.3 | AML | other | m | 2021-09-18T06:03:43.62 |
| IV.CASP.HHN. | ML:1.7 | 0.00022250000000000001 | 0.3 | AML | other | m | 2021-09-18T06:03:43.76 |
| IV.ARCI.HHN. | ML:1.7 | 0.00015300000000000003 | 0.14 | AML | other | m | 2021-09-18T06:03:46.24 |
| IV.ARCI.HHE. | ML:1.7 | 0.0001385 | 1.56 | AML | other | m | 2021-09-18T06:03:46.00 |
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.