In this article we investigate the blowup behavior of semilinear stochastic partial differential equations of the prototype \(\begin{aligned} \textrm{d}u(t,x)=\left[ -(-\Delta )^{\alpha /2}u(t,x)-q(x)u(t,x) +\gamma u(t,x)+G(u(t,x))\right] \,\textrm{d}t+\kappa u(t,x)\,\textrm{d}Z_t \end{aligned}\) on the space \(\mathbb {R}^{d}\) , where \(\alpha \in (0,2]\) , \(\gamma ,\kappa \in \mathbb {R}\) , q is a nonnegative locally bounded function such that \(q(x)\rightarrow \infty \) as \(|x|\rightarrow \infty \) , G is a locally Lipschitz continuous function, and Z is a real-valued centered Gaussian process with Hölder continuous paths with exponent \(\theta >1/3\) . We show that there exists a random maximal interval \([0,\tau )\) where the solution exists and is unique. Moreover, we show that the solution explodes in \(L^{\infty }\) -norm on the event \(\{\tau <\infty \}\) . For the case where G(x) is of the form \(C|x|^{1+\beta }\) for some constants \(\beta ,C>0\) , we obtain estimates for the blowup probability, the blowup time, and the blowup rate of the solution. These bounds are given in terms of the exponential functional of Z.
