xquantize/global-volcanic-eruptions-holocene-record

Global Volcanic Eruptions: Holocene Record

11,089 documented volcanic eruptions from 1,196 volcanoes worldwide, spanning the Holocene period (~12,000 years), sourced directly from the Smithsonian Institution's Global Volcanism Program (GVP) via their official GeoServer web service.

One row per eruption event, joined to per-volcano location and geological metadata. Every ambiguous or edge-case record is flagged rather than dropped, so the dataset preserves the real shape of the historical record instead of a cleaned-up illusion of it.

TL;DR

• 11,089 eruptions across 1,196 volcanoes, Holocene scope (plus one flagged pre-Holocene outlier).
• Two joined GVP tables (eruptions plus volcanoes) on Volcano_Number; zero duplicate IDs, zero full-duplicate rows.
• Uncertain eruptions, missing VEI, missing volcano metadata and imprecise dates are kept and flagged, not silently removed.
• Not MIT. GVP data are U.S. Government works under the Smithsonian Terms of Use: free for personal, educational and non-commercial use with attribution. See Licensing.

Dataset structure

A single CSV, global_volcanic_eruptions_holocene.csv (~4.3 MB), one row per eruption, 37 columns. The most important columns:

Column	Type	Description
FID	str	Internal GVP feature ID from the source web service. Not meaningful for analysis — safe to drop.
Volcano_Number	int	GVP unique volcano identifier. The join key between the eruption and volcano tables.
Volcano_Name	str	Name of the volcano.
Eruption_Number	int	GVP unique eruption identifier.
Activity_Type	str	Confirmed Eruption or Uncertain Eruption.
ExplosivityIndexMax	float	Volcanic Explosivity Index (VEI), 0–8 scale. Null for 24.3% of eruptions (see caveats).
ExplosivityIndexModifier	str	Qualifier on the VEI value (mostly null; populated only when GVP has a specific caveat).
ActivityArea	str	Named vent, crater or sub-feature within the volcano (often null).
ActivityUnit	str	More granular sub-unit of ActivityArea, e.g. a tephra layer (91.8% null).
StartEvidenceMethod	str	Dating method for the eruption's start (historical observation, radiocarbon, tephrochronology, …).

Additional columns in the file cover eruption start/end dates, geographic coordinates and per-volcano geological metadata, plus the cleaning flags described below (has_volcano_metadata, pre_holocene_outlier, start_date_precision).

How it was built

Two source tables from the GVP GeoServer WFS service a Holocene Eruptions layer (one row per eruption event) and a Holocene Volcanoes layer (location/geological metadata per volcano) joined on Volcano_Number. No fuzzy matching: the join is on GVP's own integer keys and both eruption and volcano IDs are unique with no full-duplicate rows.

Data cleaning & decisions

Every judgement call is surfaced and edge cases are flagged, not deleted.

Uncertain eruptions are retained, not filtered. 9,918 Confirmed Eruption plus 1,171 Uncertain Eruption. "Uncertain" reflects unverifiable historical evidence, not fabrication; dropping it would discard 10.6% of real data. Filter Activity_Type yourself if you want confirmed-only.

Missing volcano metadata is flagged. 266 eruptions (2.4%) have no matching volcano record, likely subsidiary vents or synonyms not separately catalogued. Kept and flagged via has_volcano_metadata rather than dropped.

The one pre-Holocene outlier is flagged, not removed. A single eruption (~55,500 years ago, Golden Trout Creek, dated via cosmic-ray exposure) predates the nominal Holocene window. It's a real, sourced data point, flagged via pre_holocene_outlier.

Missing VEI is preserved as null. ExplosivityIndexMax is null for 24.3% of eruptions — VEI can't always be determined for older or less-observed events. Kept as NaN rather than dropped or imputed, to avoid biasing the set toward recent, well-studied eruptions.

Date precision varies and is explicitly flagged — read this before any fine-grained temporal analysis. Many historical eruptions are known only to the year or month, not the day and the source uses placeholder dates rather than blanks:

• July 2nd appears to serve as a year-only-precision placeholder (confirmed via evidence method, 95% of these cite vague historical "Observations: Reported").
• The 16th of the month appears to serve as a month-only-precision placeholder (confirmed by its even spread across all 12 months, rather than genuine clustering).

A start_date_precision column flags these as year (probable placeholder), month (probable placeholder) or day (assumed exact). This cannot be determined with 100% certainty per row, so treat day/month-level precision with caution for fine-grained work.

Negative years mean BCE. e.g. -8300 = 8300 BCE, not an error.

Validation checks passed. VEI values within the valid 0–8 scale; coordinates within valid lat/lon ranges; no eruption logically ends before it starts.

Example usage

import pandas as pd
from datasets import load_dataset

ds = load_dataset("xquantize/global-volcanic-eruptions-holocene", split="train")
df = ds.to_pandas()

# Confirmed eruptions with a known VEI, day-level date precision
clean = df[
    (df["Activity_Type"] == "Confirmed Eruption")
    & df["ExplosivityIndexMax"].notna()
    & (df["start_date_precision"] == "day")
]
print(len(clean), "high-confidence eruptions")

Not intended for: commercial redistribution without observing the Smithsonian terms; fine-grained daily-resolution analysis without honoring start_date_precision; or treating missing VEI as zero.

Provenance

Smithsonian Institution, Global Volcanism Program, Volcanoes of the World (VOTW) database.

Queried directly via the GVP GeoServer WFS web service, pulling the Holocene Eruptions and Holocene Volcanoes layers, then joined on Volcano_Number. Snapshot corresponds to VOTW v. 5.3.6 (2025).

Licensing

License: other Smithsonian Terms of Use for GVP Content.

GVP data are produced by employees of the U.S. Government and are provided under the Smithsonian Terms of Use, which invite use for personal, educational and other non-commercial purposes with attribution. This is not an MIT/BSD software license and not a blanket public-domain dedication, please observe the Smithsonian terms and cite GVP as below. If your use is commercial, review the Smithsonian Terms of Use and contact GVP as needed.